A Houthi Shiite fighter stands guard as people search for survivors under the rubble of houses destroyed by Saudi airstrikes near Sanaa airport in Yemen on Thursday. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP

Kurdish peshmerga fighters keep watch during the battle with Islamic State militants on the outskirts of Mosul on Jan. 21. Azad Lashkari/Reuters/Landov hide caption

itoggle caption Azad Lashkari/Reuters/Landov

Shiite fighters and Sunni fighters, who have joined Shiite militia groups known collectively as Hashid Shaabi ("Popular Mobilization") to fight the Islamic State, gesture Tuesday next to former Iraqi President Saddam Hussein's palaces in the Iraqi town of Ouja, near Tikrit. Thaier Al-Sudani/Reuters/Landov hide caption

itoggle caption Thaier Al-Sudani/Reuters/Landov

Dura Europos, a Roman walled city in eastern Syria, dates back to 330 B.C. The main gate is shown here in a photo from 2010. It's one of the many important archaeological sites militants of the self-styled Islamic State have ransacked and damaged. EPA /Deir Ezz-Zour Antiquities Department/Landov hide caption

itoggle caption EPA /Deir Ezz-Zour Antiquities Department/Landov

Members of a Saudi women's soccer team, Rana Al Khateeb (left) and captain Rawh Abdullah, practice at a secret location in the capital Riyadh in 2012. Saudi women have had only rare opportunities to play sports. The country sent women to the Olympics for the first time in 2012 and now girls will be allowed to take physical education classes at public schools. Hassan Ammar/AP hide caption

itoggle caption Hassan Ammar/AP

These pop-up targets are part of an advanced drill, named "friend or foe," that tests shooter reaction times. Some targets have a camera, and others, like these pictured, have a gun. The shooter must decide within seconds whether to shoot. Deborah Amos/NPR hide caption

itoggle caption Deborah Amos/NPR

Syrian volunteers cover mosaics in the Ma'arra museum with a protective layer of glue, covered by cloth. Ma'arra Museum Project/Safeguarding the Heritage of Syria and Iraq Project hide caption

itoggle caption Ma'arra Museum Project/Safeguarding the Heritage of Syria and Iraq Project

Saudi women, shown here at a cultural festival near the capital Riyadh on Sunday, still need the permission of male relatives to travel and even receive certain medical procedures, but a growing number are entering the workforce. Fayez Nureldine/AFP/Getty Images hide caption

itoggle caption Fayez Nureldine/AFP/Getty Images

Saudi Arabia's Prince Turki al-Faisal, shown in 2013 in Bahrain, says the 'pinpricks' against the Islamic State have not been effective. The former intelligence chief also says the campaign needs to be better coordinated. Mohammed Al-Shaikh/AFP/Getty hide caption

itoggle caption Mohammed Al-Shaikh/AFP/Getty

Saudi Arabia's King Salman, who assumed the throne on Friday, is shown at the G20 conference in Brisbane, Australia, on Nov. 15, 2014, when he was the crown prince. His succession went smoothly, but the new monarch faces a region in turmoil. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Militants of the Islamic State stand with a captured Iraqi army Humvee outside Baiji oil refinery, north of Baghdad, in June 2014. While there is increased radicalization in many parts of the Arab world, there are also groups and individuals working to deradicalize young Muslim men. AP hide caption

itoggle caption AP

A screen shot from Seven Quests shows a battle with the hero, Rostam, and his troops. The game is based on a 1,000-year-old Iranian poem. Courtesy of Gameguise hide caption

itoggle caption Courtesy of Gameguise