Protesters chant '16 shots' over Chicago police shooting

The US city of Chicago remains on edge after hundreds of protesters took to the streets to vent their anger over a police dashcam video.

They shouted "16 shots", a reference to the number of times a white officer in the video is seen shooting the black teenager, who appears to pose little physical threat to the officer.

It's just the latest in a string of incidents involving the police that has sparked a national conversation about race and violence.

The BBC's Rajini Vaidyanathan reports from Washington DC.