Syrian mourners in Qusayr, a few miles outside Homs, carry the body of a man killed by shrapnel, during his funeral on Tuesday. After a month-long assault by the Syrian army, rebels were forced to retreat from Homs on Thursday. Gianluigi Guercia/AFP/Getty Images hide caption

itoggle caption Gianluigi Guercia/AFP/Getty Images

Women sit at a bus stop under election posters in Qom, about 75 miles south of Iran's capital, Tehran, on Tuesday. Iran's parliamentary elections on Friday are expected to be a contest between various conservative factions. Many candidates seeking change have been barred from running. Raheb Homavandi/Reiters/Landov hide caption

itoggle caption Raheb Homavandi/Reiters/Landov

This frame grab from video provided by the SITE Intel Group shows al-Qaida's leader Ayman al-Zawahiri calling on Muslims to support rebels in Syria. The video was released earlier this month. AP hide caption

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Egyptian presidential candidate and former Arab League Secretary General Amr Moussa delivers a speech to Bedouins in Ras Sidr during a campaign trip to the South Sinai last week. Egyptians are anticipating the first presidential elections after last year's ouster of Hosni Mubarak. Asmaa Waguih/Reuters/Landov hide caption

itoggle caption Asmaa Waguih/Reuters/Landov

An Iraqi jet fired missiles that hit the USS Stark in the Persian Gulf in 1987, killing 37 U.S. sailors. Iraq and Iran were at war at the time, and the U.S. wanted to keep open the regiion's vital oil shipping lanes. The current friction between the U.S. and Iran has again raised tension in the Gulf. U.S Navy/AP hide caption

itoggle caption U.S Navy/AP