Saudi Arabia's army fires artillery shells toward Houthi rebels along the Saudi border with Yemen on April 15. Outside Saudi Arabia, many are critical of the military campaign and question whether it will succeed, but it is popular inside the kingdom. STR /Reuters/Landov hide caption

itoggle caption STR /Reuters/Landov

The Migrant Offshore Aid Station (MOAS) carries out its first rescue in the Mediterranean in August 2014. The Malta-based private rescue service founded by a wealthy American and his Italian wife has rescued more than 3,000 migrants since its launch in August 2014. Barcroft Media /Landov hide caption

itoggle caption Barcroft Media /Landov

Survivors are escorted from the National Bardo Museum in Tunis on Wednesday. At least 20 foreign tourists were reportedly killed in the attack. Mohamed Messara/EPA/Landov hide caption

itoggle caption Mohamed Messara/EPA/Landov

A photo from the wedding of Ahmed Shehata and Shaimaa Daif shows friends of the couple mocking members of the so-called Islamic State. Shehata says he staged the surprise to show his wife that ISIS was "something to laugh at, not to fear." Courtesy of Ahmed Shehata hide caption

itoggle caption Courtesy of Ahmed Shehata

Relatives and supporters of Egyptian activist Alaa Abdel Fattah react after Monday's verdict in a trial over an illegal protest. Khaled Desouki/AFP/Getty Images hide caption

itoggle caption Khaled Desouki/AFP/Getty Images

Relatives of Egyptian Coptic Christians purportedly murdered in Libya by self-proclaimed Islamic State militants mourn for those killed. Mohamed el-Shahed/AFP/Getty Images hide caption

itoggle caption Mohamed el-Shahed/AFP/Getty Images