An image of 13-year-old Hamza al-Khateeb is surrounded by candles in this photo from a Facebook page in his memory. From Facebook.com hide caption

itoggle caption From Facebook.com

Bahraini protesters hold up flowers toward riot police near the Pearl Roundabout in February. On March 18, the government demolished the monument, which had become a prominent gathering place for opposition protesters. Hasan Jamali/AP hide caption

itoggle caption Hasan Jamali/AP

Protesters demand that Syrian President Bashar al-Assad step down, in front of Arab League headquarters in Cairo. Amr Nabil/AP hide caption

itoggle caption Amr Nabil/AP

Supporters of cleric Muqtada al-Sadr march in front of two large Iraqi flags with the Arabic words "God is great," in the Sadr City district of Baghdad on Thursday. Tens of thousands of Sadr's followers rallied to demand the U.S. military leave Iraq at the end of the year. Hadi Mizban/AP hide caption

itoggle caption Hadi Mizban/AP

A Palestinian family waits to cross from the Gaza Strip into Egypt through the Rafah border crossing on Saturday. Bernat Armangue/AP hide caption

itoggle caption Bernat Armangue/AP