Missouri

Chief Jon Belmar said at a news conference that officers had been tracking the man, who they believed was armed, during a protest marking the death of Brown, the black, unarmed 18-year-old whose killing by a white Ferguson police officer touched off a national "Black Lives Matter" movement.

The man approached the officers, who were in an unmarked police van, and opened fire, Belmar said. The officers returned fire from inside the vehicle and then pursued the man on foot when he ran.

The march late Sunday morning begins at the site where Brown, who was black and unarmed, was fatally shot by Ferguson officer Darren Wilson on Aug. 9, 2014. A grand jury and the U.S. Department of Justice declined to prosecute Wilson, who resigned in November, but the shooting touched off a national "Black Lives Matter" movement.

A three-judge panel with the 8th U.S. Circuit Court of Appeals on Tuesday declined without comment David Zink's claims that the death penalty is unconstitutional.