The area around the embassy was swarming with police, said journalist Golnar Motevalli in Ankara.

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Matonga said the embassy officials were traveling in an area they didn't have authorization to enter.

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By late evening, security forces and antiriot police had secured the area and cleared the embassy premises of protesters.

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In the emails, sent from her home in the Methil area, Jackson told US Embassy staff that there were to be explosions at the building in Grosvenor Square, London.

BBC: President Barack Obama

Television video also showed what appeared to be a U.S. guard in a helmet and body armor surveying the area from the roof of an embassy building.

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In a statement on Monday, the US embassy in Rangoon advised US citizens "to avoid travel to the Mandalay region because of escalating violence in that area".

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