In spite of a strong police and army police presence, around 300 protestors managed to congregate just minutes from the summit venue, the David H Lawrence convention centre, where Prime Minister Gordon Brown will meet with the leaders of the other 18 countries plus the European Union.
Police threw canisters of pepper spray and smoke at marchers as US President Barack Obama and his wife, Michelle, arrived for a meeting with leaders of the world's major economies.
The protest close to the summit largely involved members of a Free Tibet lobby group, as well as individuals demonstrating for more jobs, and one man whose face was daubed in black and red paint and was seen taunting officers.
Police managed to contain the scuffle, however, with the giant "ring of steel" surrounding the summit venue, ensuring no protestors managed to get even close, although chants from the crowd could be heard at the convention centre.
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