(excerpt from) The Indy Channel / AP Story
G-20 Opponents, Police Clash In Pittsburgh
Officers Fire Pepper Spray, Tear Gas
Daniel Lovering, Associated Press Writers/ 2:41 pm EDT September 24, 2009
PITTSBURGH — Police threw canisters of pepper spray and smoke at anarchists protesting the Group of 20 summit Thursday after the marchers responded to calls to disperse by rolling trash bins and throwing rocks.