Transcript for Footage released of fatal Chicago police shooting of teen
Good evening, and it's great to have you with us here on a we begin with the mayor of Chicago urging calm after very difficult police body cam video was released today in a case that already made national headlines. The fatal police shooting of a 13-year-old boy. The officer had been responding to report of shots fired, encountering two suspects, chasing one of them, that 13-year-old boy, down an alley. The officer's body camera capturing that encounter. The 13-year-old appearing to stop and turn at one point, appearing to raise his hands. The officer fires the shot. The officer said the suspect had a gun. A still image from that video tonight, Adam Toledo, his hands raised. Authorities say a handgun was found feet away. Lori Lightfoot saying it was an unwinnable situation. But saying the city, quote, failing the boy. The mayor calling for calm tonight. Pierre Thomas leading us off with the images, and again, we warn the video is difficult to watch. Reporter: You're about to witness a tragedy unfold in the blink of an eye. Just after 2:00 in the morning on March 29th, Chicago police respond to reports of shots fired. Chicago emergency, Travis. Hi, um, I just heard gunshots. About how many shots did you hear? A lot. More than five. Reporter: An officer arrives at the scene, body camera rolling. He chases one of the two suspects, racing through an alley in hot pursuit, shoving a bystander aside during the chase. Then suddenly a confrontation. The officer yelling to see the suspects hands. The suspect stopping and turning quickly. The officer fires a shot. The officer begins cpr, but it's too late. When the confusion is over, we learn the suspect is only 13 years old. His name is Adam Toledo. The officer has said the boy had a gun in his hand. You can see a handgun a few feet away from the young man along this fence. But at the critical moment in some of the videos when the shot was fired it's hard to see any gun in the boy's hands. An investigation is ongoing to determine what happened. Today Chicago's mayor said it's all too much -- a boy out in the city in the wee hours with an adult. A handgun in the mix. An unwinnable situation with an almost predictable terrible ending. In the middle of the night, this child was in contact with an adult who had a gun. There are a number of forces that met up at 2:30 in the morning on March 29th in an alley. And simply put, we failed Adam. And Pierre Thomas with us tonight live from Washington. What more have you learned, Pierre? Reporter: The officer has been placed on administrative leave pending the investigation. As for family members, their attorneys released a joint statement with the mayor saying the release of the video is a first step toward healing, and David, they're calling for peace. Pierre Thomas leading us off tonight. Pierre, thank you.
This transcript has been automatically generated and may not be 100% accurate.