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By Associated Press
The attacker was captured, a police instruction said. It was not said how many casualties occurred on board the bus and how many pedestrians.
A video clip on the Beijing newspaper website showed half a dozen police officers wrestling the attacker in the middle of a street, traffic flowing past him.
Xinhua said police have identified the attacker as a 48-year-old unemployed man. The Intelligence Service said initial investigations had revealed that the man had earlier had a conflict with a neighborhood committee official he had long argued with.
The investigation was continued.