The Associated Press: G-20 march turns chaotic on streets of Pittsburgh

The Associated Press: G-20 march turns chaotic on streets of Pittsburgh: "Police are throwing canisters spewing smoke after ordering several hundred protesters to stop their march in opposition of the Group of 20 summit in Pittsburgh. The march does not have a city permit and police have declared it an unlawful assembly. They played an announcement over a loudspeaker telling people to leave or face arrest or 'other police action.'"