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The Venezuelan President, Hugo Chavez, has accused Colombia of carrying out a military incursion into Venezuela.
Mr Chavez said Colombian soldiers had recently been seen crossing the Orinoco river, which forms part of the border, and entering Venezuelan territory.
He said the alleged incursion was a "provocation" by Colombia's government.
The accusations came shortly before a summit of South American leaders is due to discuss a Colombian proposal to allow US troops access to its bases.
Mr Chavez has been embroiled in a diplomatic row with his Colombian counterpart, Alvaro Uribe, ever since news of the plan emerged. source: bbc.com