A police watchdog agency Thursday released a video showing a Chicago police officer making a split-second decision to shoot Adam Toledo after seeing what appeared to be a gun in the hand of the 13-year-old boy, whose arms were raised when he was shot and killed.

Police have said they found a gun at the scene of the shooting and that it was the weapon Adam was holding. The officer’s body-cam video doesn’t show Toledo throwing away the weapon before he was shot and when his hands were raised, he didn’t appear to be holding a weapon.

But another video shows Toledo apparently throwing something through a gap on the other side of the fence and police video shows an officer discovering a handgun at that spot, about 10 feet away.

The officer who shot Toledo was wearing a body camera that shows him chasing Toledo down an alley in Little Village at about 2:38 a.m. on March 29, the Sun-Times reports.

The officer yells “stop” and then orders Toledo to show his hands. Then the officer shouts “drop it!” and fires.

A slowed-down version of the video, prepared by the Chicago Police Department, shows Adam standing in a large gap in a wooden fence with his side to his officer and what appears to be a gun behind his back.