"A large Atlanta police force including motorcycles, mounted police, officers on foot, a SWAT team in riot gear and a helicopter moved in aggressively and faced off with the marchers," protest organizers said in a statement. "Peace was maintained until a policeman on a motorcycle accelerated into a demonstrator."

Police said a protester was charged with aggravated assault and obstruction for assaulting a motorcycle officer patrolling the area.

Occupy Atlanta protesters return to streets after police crackdown