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KABUL, May 31 (Reuters) - A big explosion went off in the Afghan capital, Kabul, on Wednesday, sending clouds of black smoke spiralling over the centre of the city in an area near the presidential palace and foreign embassies.

Houses hundreds of metres away from the blast were damaged with windows and doors blown off their hinges.

There was no immediate word on casualties.

(Reporting by James Mackenzie; Editing by Robert Birsel)