Los Angeles police have shot and killed a homeless man in an encounter caught on video and viewed millions of times online. The footage shows police wrestling the man to the pavement and deploying a Taser. In the foreground, a woman who tries to pick up an officer’s baton is also wrestled to the ground. A voice in the background appears to yell “drop the gun” before at least five gunshots are heard. A warning: This footage is graphic. The man, identified by witnesses as “Africa,” was pronounced dead at the scene. Police say they opened fire after a struggle over an officer’s gun. One witness described his account of the shooting.

Witness: “About five officers wrestled him down to the ground. He managed to get up. They took him down again. Then they beat him while he was on the ground. Next thing I knew, I heard one shot. And I looked over across the street, and I seen three more shots being fired at the guy, who was laying down on the ground.”

Los Angeles police say they are investigating.