Protesters climb a fence at the U.S. embassy in Sanaa, Yemen, on September 13, 2012. Hundreds of Yemeni demonstrators stormed the U.S. embassy in Sanaa on Thursday in protest against a film they consider blasphemous to Islam, and security guards tried to hold them off by firing into the air.

Protesters attack the U.S. embassy in Sanaa, on September 13, 2012.

A protester, left, holds a white flag with Islamic inscription in Arabic that reads, "No God but Allah, and Muhammad is his prophet," in front of the U.S. embassy in Sanaa on Sept. 13, 2012.

Protesters storm the U.S. embassy in Sanaa, on September 13, 2012.

A removals van is parked outside a residential annex of the Iranian embassy in Knightsbridge, central London. on Dec. 2, 2011. Iran's diplomats in Britain prepared to leave the country as a deadline loomed for their expulsion following the storming of the British embassy in Tehran by protesters.

Removal men carry boxes from a residential anex of the Iranian embassy in London on Dec. 2, 2011. Britain has expelled Iranian diplomats and shut its mission in Tehran after an attack by protesters.

Anti Iranian government protesters demonstrate outside the Iranian embassy in London on Dec. 2, 2011.

Iranian protesters gather outside the British embassy as some break into it and bring down the British flag in Tehran on November 29, 2011. More than 20 Iranian protesters stormed the British embassy in Tehran, removing the mission's flag and ransacking offices.

EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on leaving the office to report, film or take pictures in Tehran.
Protesters enter the gate of the British embassy in Tehran November 29, 2011. Dozens of young Iranian men entered buildings inside the British embassy compound in Tehran on Tuesday, throwing rocks, petrol bombs and burning documents looted from offices, Iranian news agencies reported.

Iranian protesters break the windows of a British Embassy building, in Tehran, Iran, Tuesday, Nov. 29, 2011. Dozens of hard-line Iranian students stormed the British Embassy in Tehran on Tuesday, bringing down the Union Jack flag and throwing documents from windows in scenes reminiscent of the anger against Western powers after the 1979 Islamic Revolution. The mob moved into the diplomatic compound two days after Iran's parliament approved a bill that reduces diplomatic relations with Britain following London's support of recently upgraded Western sanctions on Tehran over its disputed nuclear program.

EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on leaving the office to report, film or take pictures in Tehran.
Protesters walk in the British embassy compound as an embassy car burns in Tehran on Nov. 29, 2011.

EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on leaving the office to report, film or take pictures in Tehran.
A protester walks with a poster from the British embassy in Tehran Nov. 29, 2011. Dozens of young Iranian men entered buildings inside the British embassy compound in Tehran on Tuesday, throwing rocks, petrol bombs and burning documents looted from offices, Iranian news agencies reported.

Protesters carry the royal coat of arms after breaking in to the British Embassy during an anti-British demonstration in the Iranian capital on Nov. 29, 2011 in Tehran, Iran. Relations between the two countries have soured further over recent weeks, with the UK Treasury imposing sanctions on Iranian banks, accusing them of supporting the country's nuclear program. The Iranian authorities insist that its nuclear plans are for peaceful purposes only and parliament has voted to downgrade diplomatic relations with the UK.