Dozens of people are reported to have been injured following a series of explosions in the Thai capital Bangkok.

At least some of the blasts were caused by grenades, an army spokesman said, but it was not clear who had fired them.

The blasts followed rising tensions in the long-running stand-off between police and anti-government protesters, the BBC reported.

Thai Prime Minister Abhisit Vejjajiva has called an emergency meeting with security chiefs, officials said.

At least 45 people were injured, including at least one foreigner, reports said.

Earlier, a military spokesman warned protesters, who have been camped out in Bangkok for six weeks, that time was running out for them to leave.

The government is under pressure to crack down on the red-shirt protesters, who say they want new elections.

Witnesses said at least one blast occurred at an elevated train station in the heart of the capital's business district.

Thai leaders have said they want a negotiated, peaceful end to the dispute, but observers say a non-violent solution is increasingly unlikely.

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