As police stood by Tuesday, an Iranian Basij militia member reared back to throw a stone toward the British embassy in Tehran. Other Basij militia members also took part in the attack, witnesses say. Atta Kenare /AFP/Getty Images hide caption

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Iranian protesters breached the gates of the British embassy in Tehran on Tuesday, tearing down the British flag and ransacking offices. Atta Kenare/AFP/Getty Images hide caption

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April 2010: Iranian President Mahmoud Ahmadinejad unveils a sample of the third generation centrifuge for uranium enrichment during a ceremony in Tehran on April 9, 2010. Iran says its nuclear ambitions are peaceful. Behrouz Mehri/AFP/Getty Images hide caption

itoggle caption Behrouz Mehri/AFP/Getty Images

A U.S. solider on patrol in the restive northern oil-rich city of Kirkuk, on July 27, 2011.

Ali Al-Saadi /AFP/Getty Images hide caption

itoggle caption Ali Al-Saadi /AFP/Getty Images