Doctors at a hospital in Aleppo, Syria, treat a boy injured in what the government said was a chemical weapons attack on March 19. Syria's government and rebels accused each other of firing a rocket loaded with chemical agents outside of Aleppo. George Ourfalian/Reuters/Landov hide caption

itoggle caption George Ourfalian/Reuters/Landov

"House Arrest" by Nikahang Kowsar: Mir Hossein Mousavi, a presidential candidate in the disputed 2009 presidential election, and his wife have been under house arrest with no charge brought against them, since early 2011. International Campaign for Human Rights in Iran hide caption

itoggle caption International Campaign for Human Rights in Iran

Saudi Arabia film director Haifaa Al-Mansour (right) receives the award of best film for her movie Wadjda at Dubai International Film Festival in Dubai, United Arab Emirates, on Dec. 16, 2012. Ali Haider/EPA/Landov hide caption

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Egyptian Christians gather around four coffins during a funeral service at the Saint Mark Coptic cathedral in Cairo on April 7. Religious violence this month has killed three Muslims and at least six Christians. Amr Nabil/AP hide caption

itoggle caption Amr Nabil/AP

President Obama meets with the emir of Qatar, Sheik Hamad bin Khalifa Al Thani, in the Oval Office on Tuesday. The emir is among a series of visiting Middle East leaders urging the U.S. to take a greater role in the Syrian conflict. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

The White House said this week that it believes Syria has been using chemical weapons, but President Obama has not said how the U.S. might respond. Here, rebel fighters in Syria prepare to launch of a rocket in the northern Syrian city of Aleppo, on April 21. The rebels have also accused the Syrian government of employing chemical weapons. Miguel Medina /AFP/Getty Images hide caption

itoggle caption Miguel Medina /AFP/Getty Images