Smoke rises near a Syrian flag hoisted up a flagpole as a result of the fighting between Syrian rebels and the Syrian Army over the control of Quneitra crossing, on Saturday. The area is where dozens of U.N. peacekeepers had been under siege by Nusra Front fighters. Atef Safadi/EPA/Landov hide caption

itoggle caption Atef Safadi/EPA/Landov

An Israeli soldier launches a drone that's attached to a military vehicle in southern Israel, not far from the border with the Gaza Strip, on July 29. Israel was a pioneer with drones and has developed a number of military technologies that it later sells abroad. Jim Hollander/EPA/Landov hide caption

itoggle caption Jim Hollander/EPA/Landov

Britain's Prime Minister David Cameron speaks at a news conference in London on Friday after the U.K. raised its terror alert level. Paul Hackett/PA Photos/Landov hide caption

itoggle caption Paul Hackett/PA Photos/Landov

An Iraqi child walks next an empty house of a Christian family in Mosul on Aug. 8. The Arabic writing on the wall reads "Real Estate of the Islamic State." The extremist group took control of Mosul, Iraq's second largest city, in June. STR/EPA/Landov hide caption

itoggle caption STR/EPA/Landov

This image, posted on a militant website, shows an Islamic State fighter waving a flag from a captured government fighter jet in Raqqa, Syria. The group is well-funded and has gained territory over the past few months; that's raised some concerns in America, although experts say the organization is largely focused on regional goals. AP hide caption

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A photo from March 2008 provided by the Hennepin County, Minn., Sheriff's Office shows Douglas McAuthur McCain, who was killed recently fighting alongside Islamic State militants in Syria. AP hide caption

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Friar Gabriel Tooma leads a service at the Chaldean Church of the Virgin Mary of the Harvest, in Al-Qosh on June 15. At the time, the Christian village in northern Iraq was taking in those fleeing violence in the nearby city of Mosul. Now the village itself is largely deserted. AP hide caption

itoggle caption AP