Photos: Another police shooting in Missouri sparks unrest

Police try to control a crowd on the lot of a gas station following a shooting Tuesday in Berkeley, Mo.   (David Carson / Associated Press)

Police try to control a crowd following a shooting in Berkeley, Mo. St. Louis County police say a man who pulled a gun and pointed it at an officer has been killed.   (David Carson / Associated Press)

The scene following a crowd scuffle with police following a shooting Tuesday in Berkeley, Mo.   (David Carson / Associated Press)

A police officer with a fire extinguisher stands in the broken-out entry to a QuikTrip following a shooting nearby Tuesday in Berkeley, Mo.   (David Carson / Associated Press)

Police photograph a gun on the ground following a shooting Tuesday at a gas station in Berkeley, Mo. St. Louis County police say a man who pulled a gun and pointed it at an officer has been killed.   (David Carson / Associated Press)