>>> TONIGHT, THE MOST HIGH PROFILE CONVICTIONS YET >>> TONIGHT, THE MOST HIGH PROFILE CONVICTIONS YET FROM THE JANUARY 6th RIOT. THE FORMER HEAD OF THE PROUD BOYS AND THREE OTHERS IN THE EXTREMIST GROUP FOUND GUILTY OF SEDITIOUS CONSPIRACY AFTER INSTIGATING THE CAPITOL ATTACK. WHY THEY BLAME FORMER PRESIDENT TRUMP, AND COULD IT IMPACT THE FEDERAL INVESTIGATION INTO HIS ACTIONS. >>> A NEW YORK SUBWAY CONFRONTATION TURNS DEADLY. THE CHAOTIC MOMENTS AND LETHAL CHOKEHOLD. THE PUBLIC OUTCRY FROM THE VIDEO. WHAT STARTED IT, AND SHOULD THERE BE CRIMINAL CHARGES? >>> THE GROWING ETHICS QUESTIONS ABOUT SUPREME COURT JUSTICE CLARENCE THOMAS. HIS BILLIONAIRE FRIEND REPORTEDLY PAYING THOUSANDS IN TUITION FOR A FAMILY MEMBER. >>> SOUTHERN CALIFORNIA HIT BY A RARE TORNADO AS MILLIONS FACE MORE SEVERE WEATHER. >>> THEY SURVIVED A DEADLY JULY 4th MASS SHOOTING. A MOTHER AND SON NOW BREAKING THEIR SILENCE ABOUT THE HORROR THEY FACED. >>> THE NFL UNDER INVESTIGATION OVER CLAIMS OF WORKPLACE DISCRIMINATION AND UNEQUAL PAY IN ITS CORPORATE RANKS. >>> IS ARTIFICIAL INTELLIGENCE GROWING TOO FAST? ED SHEERAN STEAL PART OF A MARVIN GAYE CLASSIC? WHAT A JURY DECIDED TODAY. >>> AND AMAZING RESCUE. THE HERO WHO SPOTS A BABY STROLLER ROLLING INTO DANGER. >> Announcer: THIS IS "NBC NIGHTLY NEWS" WITH LESTER HOLT. >> GOOD EVENING AND WELCOME. THEY APPEAR TO BE AMONG THE MOST DETERMINED IN THE JANUARY 6th ATTACK ON THE CAPITOL, THIRSTING FOR VIOLENCE IS HOW PROSECUTORS PUT IT. TODAY FIVE MEMBERS OF THE FAR RIGHT EXTREMIST GROUP PROUD BOYS, INCLUDING THEIR FORMER LEADER, WERE CONVICTED ON SERIOUS FELONY CHARGES RELATED TO THE CAPITOL ASSAULT. PERHAPS THE MOST SIGNIFICANT TRIAL YET. FOUR OF THEM FOUND GUILTY OF SEDITIOUS CONSPIRACY, RARE CHARGES WITH DEEP AND CHILLING HISTORICAL ROOTS. ALL OF THE DEFENDANTS CONVICTED OF INTERFERING WITH THE DUTIES OF MEMBERS OF CONGRESS IN WHAT THE GOVERNMENT ARGUED WAS AN ORGANIZED ATTEMPT TO STOP CERTIFICATION OF THE ELECTION. DEFENSE ATTORNEYS ARGUING THEIR CLIENTS WERE SCAPEGOATED. KEN DILANIAN HAS DETAILS. >> Reporter: PROSECUTORS CALLED THEM THE KEY INSTIGATORS OF THE JANUARY 6th ASSAULT ON THE U.S. CAPITAL. >> AMERICAN CITIZENS ARE STORMING THE CAPITOL. >> Reporter: AFTER A THREE-MONTH TRIAL, A JURY TONIGHT HAS FOUND FIVE MEMBERS OF THE NOTORIOUS EXTREMIST GROUP THE PROUD BOYS GUILTY OF MOST OF THE CHARGES AGAINST THEM. FOUR OF THE FIVE DEFENDANTS, INCLUDING THE GROUP'S FORMER LEADER, ENRIQUE TARRIO, WERE CONVICTED OF SEDITIOUS CONSPIRACY, A CIVIL WAR ERA LAW MAKING IT A CRIME TO VIOLENTLY RESIST THE AUTHORITY OF THE U.S. GOVERNMENT. FOUR WERE CONVICTED OF TRYING TO OBSTRUCT THE CERTIFICATION OF PRESIDENT BIDEN'S ELECTORAL COLLEGE VICTORY. AND ALL FIVE WERE CONVICTED OF INTERFERING WITH THE DUTIES OF MEMBERS OF CONGRESS, MANY OF WHOM FOUND THEMSELVES RUNNING FOR THEIR LIVES ON JANUARY 6th. TODAY'S VERDICT MAKES CLEAR THAT THE JUSTICE DEPARTMENT WILL DO EVERYTHING'S IN ITS POWER TO DEFEND THE AMERICAN PEOPLE AND AMERICAN DEMOCRACY. >> Reporter: THE EVIDENCE COMING IN SOME CASES FROM THE DEFENDANTS' OWN MOUTHS. >> JANUARY 6th WILL BE A DAY IN INFAMY. >> THE SIGNIFICANCE OF THE VERDICT IN THIS CASE DEFINITELY GOES NOT ONLY TO THESE DEFENDANTS, BUT TO OTHERS AS WELL IN OTHER INVESTIGATIONS. >> Reporter: PROSECUTORS HAVE NOT ESTABLISHED THAT THE CAPITOL ATTACK WAS PLANNED IN ADVANCE, BUT TOLD JURORS THE DEFENDANTS SET OUT THAT DAY TO ACT AS DONALD TRUMP'S ARMY, TRYING TO ILLEGALLY KEEP THE FORMER PRESIDENT IN POWER. >> STAND BACK AND STAND BY. >> Reporter: CITING THAT INFAMOUS COMMENT DURING A 2020 PRESIDENTIAL DEBATE. DEFENSE ATTORNEYS BLAME TRUMP, ASSERTING THEIR COMMANDER IN CHIEF SOLD THEM A LIE. >> IF YOU DON'T FIGHT LIKE HELL, YOU'RE NOT GOING TO HAVE A COUNTRY ANYMORE. >> Reporter: THE JURY COULDN'T DECIDE ON SOME COUNTS. BUT THE FIVE PROUD BOYS FACE DECADES IN PRISON BASED ON TODAY'S VERDICT. KEN, WHAT DOES THIS MEAN FOR THE SPECIAL COUNSEL'S CRIMINAL INVESTIGATION INTO JANUARY 6th? >> YEAH, LESTER, IT'S A SEPARATE CASE, BUT TODAY'S CONVICTIONS MAY ACTUALLY HELP THE SPECIAL COUNSEL AS IT INVESTIGATES THE OTHER WAYS THAT TRUMP AND HIS ALLIES TRIED TO STOP THE LAWFUL TRANSFER OF POWER. LESTER? >> KEN DILANIAN, THANK YOU. >>> IN NEW YORK, DEMANDS FOR CRIMINAL CHARGES TONIGHT AFTER A DEADLY CONFRONTATION IN THE SUBWAY. A MAN DYING AFTER ANOTHER PASSENGER PUT HIM IN A CHOKEHOLD. WE GET DETAILS NOW FROM STEPHANIE GOSK. AND I HAVE TO WARN YOU, SOME OF THE VIDEO IN THIS STORY IS ZURICH. DISTURBING. >> Reporter: TONIGHT THERE IS GROWING PRESSURE ON THE MANHATTAN DISTRICT ATTORNEY TO BRING CRIMINAL CHARGES AFTER A MAN WAS CHOKED TO DEATH ON THE SUBWAY MONDAY. >> HE COULD NOT BREATHE. >> Reporter: JORDAN NEELY ENDED UP ON THE FLOOR OF THE TRAIN IN A HEADLOCK AFTER POLICE SAY AN ARGUMENT TURNED INTO A VIOLENT CONFRONTATION. WHEN IT WAS OVER, NEELY WAS UNCONSCIOUS. EMS ATTEMPTS TO REVIVE THE 30-YEAR-OLD FAILED. THE MEDICAL EXAMINER RULED HIS DEATH A HOMICIDE BY CHOKEHOLD. SO FAR THERE ARE NO CRIMINAL CHARGES. THE 24-YEAR-OLD WHO HELD NEELY IN A HEADLOCK WAS TAKEN INTO CUSTODY, AND THEN RELEASED ACCORDING TO POLICE. THE VIDEO OBTAINED BY NBC NEW YORK SHOWS NEELY IN A CHOKEHOLD FOR NEARLY THREE MINUTES. THE WITNESS WHO TOOK IT SAID NEELY GOT ON THE SUBWAY AND WAS ACTING AGGRESSIVELY, TELLING RIDERS HE WAS HUNGRY, HE WAS THIRSTY, THAT HE DIDN'T CARE ABOUT ANYTHING. HE DIDN'T CARE ABOUT GOING TO JAIL. HE DIDN'T CARE THAT HE GETS A BIG LIFE SENTENCE. TODAY NEW YORK'S GOVERNOR CALLED THE CHOKEHOLD A, QUOTE, EXTREME RESPONSE. >> THERE HAD TO BE CONSEQUENCES. AND SO WE'LL SEE HOW THIS UNFOLDS. BUT HIS FAMILY DESERVES JUSTICE. >> Reporter: THE D.A.'S OFFICE IS ASKING PEOPLE TO COME FORWARD. THE CENTRAL QUESTION IS WHETHER FORCE WAS JUSTIFIED. WERE PEOPLE ON THE TRAIN THREATENED? WAS IT SELF-DEFENSE? MAYOR ERIC ADAMS SAYING HE WON'T RUSH TO JUDGMENT. >> I HAVE A RESPONSIBILITY FOR THIS ENTIRE CITY, AND I HAVE FAITH IN THE CRIMINAL JUSTICE SYSTEM, AND I'M GOING TO LET THE PROCESS TAKE ITS PLACE. >> Reporter: NEELY WAS A KNOWN STREET PERFORMER WHO WAS HOMELESS, ACCORDING TO THE NYPD. THE MANHATTAN BOROUGH PRESIDENT SAID THE MENTAL HEALTH SYSTEM FAILED HIM. THE CITY IS BATTLING BOTH A MENTAL HEALTH AND HOMELESS CRISIS, WITH NUMBERS AT SHELTERS AT THEIR HIGHEST SINCE THE GREAT DEPRESSION. THOSE WHO DON'T GO TO SHELTERS OFTEN END UP ON THE SUBWAY. >> STEPHANIE, HAVE WE HEARD FROM NEELY'S FAMILY? >> LESTER, WE'VE HEARD FROM HIS AUNT. SHE SET UP A GOFUNDME PAGE. ON IT, SHE SAYS SHE LOVES HER NEPHEW. SHE DESCRIBES HIM AS A TALENTED MAN, A DANCER. SHE SAID THE FAMILY WANTS JUSTICE FOR HIM. LESTER? >> STEPHANIE GOSK, THANK YOU. >>> SUPREME COURT JUSTICE CLARENCE THOMAS IS IN THE SPOTLIGHT AGAIN WITH A NEW REPORT HE DID NOT DISCLOSE THAT A BILLIONAIRE FRIEND PAID TUITION FOR ONE OF HIS RELATIVES. LAURA JARRETT EXPLAINS. >> Reporter: TONIGHT, SUPREME COURT JUSTICE CLARENCE THOMAS FACING MORE ETHICS QUESTIONS AFTER A PROPUBLICA REPORT THAT TOP REPUBLICAN DONOR HARLAN CROW PICKED UP THE PRIVATE SCHOOL TUITION TAB FOR THOMAS' GRAND NEPHEW, WHO HE RAISED AS HIS SON. FEDERAL LAW REQUIRES JUSTICES TO REPORT GIFTS, BUT THOMAS DID NOT DISCLOSE CROW'S TUITION PAYMENT, YET HE DID REPORT ONE MADE BY SOMEBODY ELSE IN 2002. NBC NEWS HAS CONFIRMED HAS NOT CONFIRMED THE PROPUBLICA REPORT. THAT TUITION MONEY NOW ADDING TO A GROWING LIST OF UNREPORTED PERKS PROPUBLICA SAYS CROW PAID FOR, INCLUDING LUXURY VACATIONS FOR THOMAS, A PORTION OF HIS WIFE'S SALARY, AND THOMAS' FAMILY HOME, ALLOWING HIS MOTHER TO LIVE RENT-FREE. TONIGHT NO COMMENT FROM THOMAS, WHO PREVIOUSLY SAID HE WAS ADVISED HE DID NOT NEED TO REPORT THOSE OTHER GIFTS FROM CROW, A LONG-TIME FRIEND WHO SEE HEAD HAD NO BUSINESS BEFORE THE COURT. CROW'S OFFICE SAYING HE HAS LONG BEEN PASSIONATE ABOUT THE QUALITY OF EDUCATION, BUT DEMOCRATS ARE DEMANDING A FORMAL ETHICS CODE FOR JUSTICES. >> THE REPUTATION OF THE SUPREME COURT IS AT STAKE HERE. >> Reporter: WHILE REPUBLICANS ARGUE DEMOCRATS ARE BITTER ABOUT DECISIONS FROM THE COURT'S CONSERVATIVE MAJORITY. >> HE HAS OBVIOUSLY BEEN TARGETED BECAUSE HE IS A CONSERVATIVE BLACK MAN. >> Reporter: WITHOUT REPUBLICAN SUPPORT, NOTHING WILL PASS IN CONGRESS. IT'S UP TO THE JUSTICES TO ACT OR NOT. LESTER? >> ALL RIGHT, LAURA, THANKS. >>> NOW THE CRISIS AT THE SOUTHERN BORDER. THE HOMELAND SECURITY SECRETARY THERE TODAY AS CROWDS GROW IN MEXICO AHEAD OF THE LIFTING OF THE BORDER RESTRICTION KNOWN AS TITLE 42. GABE GUTIERREZ IS THERE. >> Reporter: TONIGHT, IN JUAREZ, MEXICO, LOCAL OFFICIALS ESTIMATE AT LEAST 10,000 MIGRANTS ARE WAITING TO CROSS THE U.S. BORDER. WHAT'S BEEN THE HARDEST PART? "THE HARDEST PART IS NEVER HAVING WORK, FOOD, OR WATER" THIS MAN FROM GUATEMALA SAYS, TELLING US HE MAY CROSS WITH HIS 2-YEAR-OLD SON TODAY. OTHERS MAY WAIT UNTIL THE U.S. LIFTS THE COVID BORDER RESTRICTION KNOWN AS TITLE 42 NEXT WEEK. >> IT'S A HEARTBREAKING THING SEEING ALL THESE PEOPLE. >> Reporter: THIS CAMP HAS SPRUNG UP RIGHT NEXT TO THAT MIGRANT DETENTION CENTER WHERE 40 PEOPLE DIED IN A FIRE IN LATE MARCH. IT'S A HAUNTING REMINDER OF JUST HOW DANGEROUS THIS HUMANITARIAN CRISIS CAN BE. TODAY, HOMELAND SECURITY SECRETARY ALEJANDRO MAYORKAS VISITED SOUTH TEXAS, UNDER MOUNTING PRESSURE OVER A RECORD NUMBER OF ILLEGAL BORDER CROSSINGS. THE BIDEN ADMINISTRATION COUNTING ITS DECISION TO DEPLOY 1500 ACTIVE DUTY TROOPS TO HANDLE ADMINISTRATIVE TASKS. >> THE PRESIDENT HAS USED THE TOOLS THAT HE HAS IN FRONT OF HIM TO PREPARE AHEAD OF TITLE 42 LIFTING. >> Reporter: BUT NOW CRITICS ARE FIRING BACK. >> AS LONG AS THE BIDEN ADMINISTRATION KEEPS IN PLACE CATCH AND RELEASE, HE COULD SEND 1500 TROOPS, HE COULD SEND 10,000 TROOPS. IT WOULD DO NOTHING TO SECURE THE BORDER. >> Reporter: AND TODAY EL PASO ANNOUNCED IT WILL USE VACANT SCHOOLS TO TEMPORARILY HOUSE MIGRANT FAMILIES BEGINNING NEXT WEEK. LESTER? >> ALL RIGHT, GABE GUTIERREZ, THANK YOU. >>> THE NFL IS UNDER INVESTIGATION BY THE ATTORNEYS GENERAL OF NEW YORK AND CALIFORNIA. AT ISSUE, THE LEAKED CORPORATE CULTURE AND ALLEGATIONS OF GENDER PAY DISPARITIES AND DISCRIMINATION. MIGUEL ALMAGUER HAS DETAILS. >> Reporter: THE NEW OFF-THE-FIELD PROBE INTO THE NFL INCLUDES SERIOUS ALLEGATIONS OF WORKPLACE MISCONDUCT THAT CONTINUES TO TAINT THE LEAGUE. THE STATE ATTORNEYS GENERAL IN NEW YORK AND CALIFORNIA ISSUING NEW SUBPOENAS TODAY AS THEY INVESTIGATE CLAIMS OF HARASSMENT, GENDER PAY DISPARITIES, AND DISCRIMINATION. >> THE ALLEGATIONS, IF TRUE, PAINT A PICTURE OF A VERY HOSTILE WORK ENVIRONMENT. >> Reporter: ALSO REVIEWING CLAIMS OF OBJECTIFICATION IN THE WORKPLACE, THE A.G. CITED THIS REPORTING FROM "THE NEW YORK TIMES," WHO SPOKE TO MORE THAN 30 WOMEN DESCRIBING DEEPLY INGRAINED CORPORATE CULTURE THAT DEMORALIZED SOME FEMALE EMPLOYEES. >> THE NFL IS GOING TO HAVE TO BE ABLE TO SHOW NO, WE DON'T DISCRIMINATE. WE TREAT PEOPLE EQUALLY. WE TREAT PEOPLE EQUITABLY, AND THEY BETTER HOPE THEY HAVE PROOF TO BACK THAT UP. >> Reporter: AFTER A CONGRESSIONAL INQUIRY INTO ALLEGATIONS OF WORKPLACE MISCONDUCT BY AN NFL TEAM OWNER -- >> THE NFL HAS A SEXISM AND A RACE PROBLEM. >> Reporter: TONIGHT THE NFL SAYS THESE ALLEGATIONS ARE ENTIRELY INCONSISTENT WITH THE NFL'S VALUES AND PRACTICES. THE NFL OFFICES ARE PLACES WHERE EMPLOYEES OF ALL GENDERS, RACES, AND BACKGROUNDS THRIVE. WE DO NOT TOLERATE DISCRIMINATION IN ANY FORM. >> NO MATTER HOW BIG OR LARGE OR POWERFUL OR POPULAR AN ENTITY IS, A CORPORATION IS, YOU ARE NOT ABOVE THE LAW. >> Reporter: THE NFL SAYS IT'S COMMITTED TO A SAFE, INCLUSIVE WORK ENVIRONMENT AND WILL FULLY COOPERATE WITH THE INVESTIGATION. LESTER? >> ALL RIGHT, MIGUEL ALMAGUER, THANK YOU. >>> A DANGEROUS RARE TORNADO SWEPT THROUGH PARTS OF LOS ANGELES TODAY. IN COMPTON, THE SKY TURNED DARK BEFORE THE TWISTER STIRRED UP DEBRIS. IT'S BEEN NEARLY 60 YEARS SINCE THE LAST TORNADO THERE. THERE IS A WEATHER THREAT IN THE SOUTHERN PLAINS TONIGHT TOO. 13 MILLION ARE IN THE RISK ZONE FOR TORNADOES, DAMAGING WINDS, AND LARGE HAIL. >>> WE TURN NOW TO AN NBC NEWS EXCLUSIVE WITH A MOTHER WHO SURVIVED LAST SUMMER'S HIGHLAND PARK, ILLINOIS PARADE MASS SHOOTING, TELLING TOM LLAMAS ABOUT THE HORROR HER FAMILY ENDURED AND THE INCREDIBLE RESOLVE OF HER 8-YEAR-OLD SON. >> I REMEMBER WHAT A BEAUTIFUL DAY IT WAS. >> Reporter: A DAY THAT FOREVER CHANGED KEELY ROBERTS AND HER FAMILY. THEY WERE AT HIGHLAND PARK'S JULY 4th PARADE THAT ERUPTED WITH A MASS SHOOTING. >> I REMEMBER MY HUSBAND SAYING TO ME THAT HE THOUGHT THERE WAS A FIRECRACKER. AND I KNEW THAT I WAS HIT. I KNEW I WAS SHOT. >> Reporter: A BULLET STRIKING HER IN THE LEG. BUT AS SHE STRUGGLED TO WALK, SHE SAW ONE OF HER TWIN BOYS, 8-YEAR-OLD COOPER, MUCH MORE INJURED. HIS BROTHER LUKE LOOKING ON IN TERROR. >> I KNOW WHAT HE HAS SEEN WITH COOPER. I KNOW WHAT HE THINKS. >> Reporter: AS MOM UNDERWENT SURGERY, THE NEWS CAME. COOPER WAS ALIVE BUT PARALYZED. WHAT IS LIFE LIKE ONCE COOPER COMES HOME? >> I THINK THE BEST WAY TO EXPLAIN IT IS THAT YOU'RE OVERWHELMINGLY GRATEFUL TO HAVE COOPER BACK. >> Reporter: NEARLY A YEAR LATER, THIS IS COOPER ROBERTS TODAY, FULL OF LIFE, WITH A LOT TO SAY. >> I LOVED IT. THAT WAS MY FAVORITE. >> I'M NOT GOING TO SAY ANY SPOILERS. >> Reporter: AND RIGHT BY HIS SIDE, HIS TWIN BROTHER LUKE. >> SNORE LOUD, RIGHT, MOM? >> AND I WATCH HOW DESPERATELY HE LOVES HIS BROTHER. LUKE WILL ALWAYS BE A BIT OF A GUARD DOG FOR COOPER. >> Reporter: AND THEN THERE ARE THE MILESTONES. >> GOOD JOB, COOPER! >> HE WAS SUCH A LITTLE FISH BEFORE THE SHOOTING. >> Reporter: COOPER'S FAMILY WATCHING HIM DO THIS. THAT LITTLE BOY WHO HAD BEEN THROUGH SO MUCH, SWIMMING AGAIN ON HIS OWN. >> I THOUGHT COOPER WAS FACING HIS FEARS. THAT'S THAT MOMENT WHEN YOU SEE IT. COOPER WILL ASK ME, HOW HE'LL BE ABLE TO WALK AGAIN. COOPER IS VERY FORWARD THINKING IN TERMS OF WHAT IT WILL TAKE TO WALK AGAIN. >> Reporter: AND WHAT DO YOU TELL HIM? >> I TELL HIM THE TRUTH, ALWAYS. THAT'S THE DEAL WE HAVE. >> Reporter: THERE IS NO KNOWN CURE OR SURGERY FOR THE TYPE OF SPINAL INJURY COOPER SUFFERS. BUT KEELY BELIEVES THERE WILL BE ONE DAY. SHE IS LIVING PROOF OF HOW LIFE CAN SURPRISE YOU. >> I PUT MY CHIPS ALL IN ON THAT LITTLE BOY. I BELIEVE IN HIM. I BELIEVE IN HIM COMPLETELY. BUT I ALSO BELIEVE IN THIS COUNTRY. I'M INCREDIBLY HOPEFUL. >> Reporter: TOM LLAMAS, NBC NEWS, CHICAGO. >> A LOT OF STRENGTH IN THAT FAMILY. WE'LL BE RIGHT BACK IN 60 SECONDS WITH A CHILLING WARNING FROM THE MAN WHO HELP >>> AT THE WHITE HOUSE, A SUMMIT WITH TOP TECH LEADERS OVER THE FUTURE OF ARTIFICIAL INTELLIGENCE, JUST AS THE MAN WHO HELPED DEVELOP IT IS WARNING IT COULD THREATEN OUR VERY EXISTENCE. HERE IS TOM COSTELLO. >> Reporter: IT'S TECHNOLOGY THAT EXPERT SAYS WILL PROFOUNDLY CHANGE OUR WORLD. ARTIFICIAL INTELLIGENCE COULD SOON SUPERSEDE OUR OWN HUMAN INTELLIGENCE, PULLING FROM THOUSANDS OF YEARS OF HUMAN INNOVATION, KNOWLEDGE, PROBLEM SOLVING AND GLOBAL DATABASES. DR. JEFFREY HINTON, WHO HELPED PIONEER AI, RECENTLY LEFT GOOGLE TO WARN AI IS GROWING TOO FAST. DO YOU BELIEVE THAT ARTIFICIAL INTELLIGENCE, AS IT GROWS AT THIS POSES AN EXISTENTIAL THREAT TO HUMANS? >> YEAH, I THINK IT'S POSSIBLE. >> Reporter: AI IS ALREADY REINVENTING SCIENCE, MEDICINE AND MUSIC, BUT ALSO PRODUCING FAKE NEWS, PHOTOS AND VIDEOS, POTENTIALLY UNDERMINING DEMOCRACY, EVEN REPLACING HUMANS IN CRITICAL JOBS. AT THE WHITE HOUSE TODAY, FOUR TOP TECH CEOs MEETING WITH THE VICE PRESIDENT ABOUT AI'S PROMISE AND PERIL. >> IT'S DEFINITELY GOING TO BE A CHALLENGE, BUT IT'S ONE I'M SURE WE CAN HANDLE. >> Reporter: NOT ANTICIPATING PHOTOS OF TODAY'S SUMMIT, WE TOLD AI TO CREATE AN IMAGE OF THE MEETING, UNDERSCORING THE THREAT, THIS IS WHAT IT CREATED. THIS IS NOT A REAL PHOTO. IT WAS CREATED BY AN AI PROGRAM WITH THE NAMES OF PEOPLE ATTENDING, INCLUDING PRESIDENT BIDEN. >> ARTIFICIAL INTELLIGENCE HAS ENORMOUS POTENTIAL AND ENORMOUS DANGER. >> Reporter: LATE TODAY, REAL VIDEO FROM THE WHITE HOUSE. >> OUR JOB IS TO MAKE SURE THAT WE DO SEIZE THE BENEFITS, AND WE HAVE TO START BY MITIGATING THE RISKS. >> I THINK IT'S POSSIBLE THAT PEOPLE ARE JUST A PASSING PHASE IN EVOLUTIONARY INTELLIGENCE. >> PEOPLE A PASSING PHASE. IN OTHER WORDS, COMPUTERS WILL TAKE OVER? >> YES, THAT'S POSSIBLE. >> Reporter: THE CONCERN AI MAY BE SPREADING TOO FAST TO CONTAIN. EMILIE IKEDA, NBC NEWS, NEW YORK. ♪♪ >>> COMING UP, THE HEART-STOPPING MOMENT A BABY STROLLER NEARLY CRASHING INTO TRAFFIC. MEET THE HERO WHO SAVE >>> FINALLY, THE HERO WHO JUMPED INTO ACTION, SAVING A BABY. AND IT WAS ALL CAUGHT ON CAMERA. ERIN McLAUGHLIN WITH OUR "INSPIRING AMERICA." >> Reporter: SURVEILLANCE FOOTAGE CAPTURING THE HARROWING MOMENT A GUST OF WIND BLEW A STROLLER WITH BABY TOWARD A BUSY HIGHWAY. >> I CAUGHT IT DOWN HERE. >> Reporter: TONIGHT THE HERO OF THIS HEART-STOPPING VIRAL VIDEO SPEAKING OUT. >> REALLY WOULDN'T WANT TO SEE THE END RESULT IF I WASN'T THERE. >> Reporter: THE STROLLER ON THE MOVE, THE BABY'S GREAT AUNT STRUGGLING TO REACH THE INFANT. >> I HEARD SCREAMING TO THE RIGHT. >> Reporter: EYEWITNESS DONNA GUNDERSON WAS SITTING AT A NEARBY PATIO. >> AND I SEE A STROLLER GOING DOWN THE DRIVEWAY, AND MY HEART DROPPED. >> Reporter: JUST BEFORE THE BABY ROLLS ON TO A HIGHWAY -- >> IT WAS A VERY SCARY MOMENT. >> Reporter: YOU SEE GUNDERSON'S BROTHER RON SAVE THE DAY. >> I KNEW I CAN GET IT, AND I GOT IT. AND I'M THANKFUL FOR THAT. >> Reporter: HE SAYS THE BABY'S GREAT AUNT IS SHAKEN BUT OKAY. >> SHE TRIED EVERYTHING SHE POSSIBLY COULD TO GET UP. HER KNEES WERE BLEEDING WHEN I GOT UP TO HER, AND SHE WAS STILL SHOCKED. SHE WAS CRYING. >> Reporter: RON TELLING NBC'S LOS ANGELES STATION HE HAS FALLEN ON HARD TIMES, AT ONE POINT HOMELESS AND STRUGGLING WITH DEPRESSION. >> YOU WANT SOMETHING DIFFERENT IN YOUR LIFE, YOU'RE GOING TO DO SOMETHING DIFFERENT. AND THAT'S WHERE I'M AT TODAY. >> Reporter: AFTER THIS CLOSE CALL, RELIEF, FOR HAVING BEEN IN THE RIGHT PLACE AT THE RIGHT TIME. ERIN McLAUGHLIN, NBC NEWS, LOS ANGELES. >> BOY, EVEN KNOWING IT TURNS OUT OKAY, IT GETS YOU, DOESN'T IT? THAT'S "NIGHTLY NEWS" FOR THIS THURSDAY. THANK YOU FOR WATCHING, EVERYONE. I'M LESTER HOLT. PLEASE TAKE CARE OF YOURSELF AND EACH OTHER. GOOD NIGHT.