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Trouble has flared as world leaders gather in the US city of Pittsburgh for the G20 summit.
Police fired canisters of pepper spray and smoke at marchers after they caused trouble by rolling rubbish bins and throwing rocks.
The clashes began after hundreds of protesters, many shouting anti-capitalist slogans, tried to march from the outlying Lawrenceville neighbourhood toward the convention centre where the summit is being held.
The protesters banged on drums and chanted as they marched through the streets.