Islamic State Hostages Glance(01 of29)
Open Image ModalFILE - In this Nov. 11, 2012 file photo, freelance British photojournalist John Cantlie poses with a Free Syrian Army rebel in Aleppo, Syria. The British photojournalist has appeared in several Islamic State propaganda videos delivering statements, purportedly from the Syrian border town of Kobani and Mosul, Iraq\'s second-largest city, likely under duress. He was kidnapped with American journalist James Foley in November 2012. An Islamic State group militant beheaded Foley in August 2014. (AP Photo, File) (credit:ASSOCIATED PRESS)
Anti-regimist forces in Aleppo(02 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 03: Smoke rises during an ongoing fight against Syrian Regime Forces in Tal Mayyasat town of Aleppo, Syria on February 03, 2015. Al-Sham Front, backed by Ansaruddin factions, seized control of the strategic town of Tal Mayyasat and killed 30 regime soldiers in northeastern Aleppo, opposition forces reported. (Salih Mahmud Leyla - Anadolu Agency) (credit:Anadolu Agency via Getty Images)
Buildings damaged after Syrian army attack in Aleppo(03 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 02: Damaged buildings are seen after Syrian army helicopters attacked with barrel bombs in the al-Maadi region of Aleppo, Syria on February 2, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Buildings damaged after Syrian army attack in Aleppo(04 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 02: People are seen near a damaged building after Syrian army helicopters attacked with barrel bombs in the al-Maadi region of Aleppo, Syria on February 2, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Buildings damaged after Syrian army attack in Aleppo(05 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 02: Damaged buildings are seen after Syrian army helicopters attacked with barrel bombs in the al-Maadi region of Aleppo, Syria on February 2, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Buildings damaged after Syrian army attack in Aleppo(06 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 02: People are seen near a damaged building after Syrian army helicopters attacked with barrel bombs in the al-Maadi region of Aleppo, Syria on February 2, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(07 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: A 16th division member of Free Syrian Army (FSA) is seen during the attacks against Assad regime forces in Ashrafieh district of Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(08 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: 16th division members of Free Syrian Army (FSA) are seen during the attacks against Assad regime forces in Ashrafieh district of Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(09 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: 16th division members of Free Syrian Army (FSA) are seen during the attacks against Assad regime forces in Ashrafieh district of Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Syrian oppositions attack Assad regime forces in Aleppo(10 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 01: Syrian opposition armed group Damascus Front stage attacks against 80th Brigade of Assad regime forces with light and heavy weapons in northern Aleppo, Syria on February 01, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Syrian oppositions attack Assad regime forces in Aleppo(11 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 01: Syrian opposition armed group Damascus Front stage attacks against 80th Brigade of Assad regime forces with light and heavy weapons in northern Aleppo, Syria on February 01, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Syrian oppositions attack Assad regime forces in Aleppo(12 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 01: Syrian opposition armed group Damascus Front stage attacks against 80th Brigade of Assad regime forces with light and heavy weapons in northern Aleppo, Syria on February 01, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Syrian oppositions attack Assad regime forces in Aleppo(13 of29)
Open Image ModalALEPPO, SYRIA - FEBRUARY 01: Syrian opposition armed group Damascus Front stage attacks against 80th Brigade of Assad regime forces with light and heavy weapons in northern Aleppo, Syria on February 01, 2015. (Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(14 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: A 16th division member of Free Syrian Army (FSA) make preparations with an antitank missile during the attacks against Assad regime forces in Ashrafieh district of Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(15 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: Howitzers, made up by propane cylinder and named \'hell\', are seen during the operation staged by the 16th division members of Free Syrian Army (FSA) against Assad regime forces in Ashrafieh district of Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(16 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: A general view of destroyed buildings in Ashrafieh district during the operation staged by 16th division members of Free Syrian Army (FSA) with howitzers, made up by propane cylinder and named \'hell\', rocket-propelled grenades (RPG) against Assad regime forces is seen in Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Free Syrian Army gaining ground in Aleppo against Assad regime forces(17 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 31: A general view of an area of Ashrafieh district during the operation staged by 16th division members of Free Syrian Army (FSA) with howitzers, made up by propane cylinder and named \'hell\', rocket-propelled grenades (RPG) against Assad regime forces is seen in Aleppo, Syria on January 31, 2015. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Mideast Syria(18 of29)
Open Image ModalThis photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, shows a Free Syrian Army fighter as he prepares a locally made missile to be fired against Syrian government forces, in Aleppo, Syria, Tuesday June 10, 2014. Fighting in eastern Syria between Islamic rebel brigades and an al-Qaida splinter group has killed more than 630 people and uprooted at least 130,000 since the end of April, an activist group said Tuesday. (AP Photo/Aleppo Media Center, AMC) (credit:ASSOCIATED PRESS)
Mideast Syria(19 of29)
Open Image ModalThis photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, shows a Syrian man looking at a damaged pickup which was carrying house belongings on a street that attacked by a government forces airstrike, in Aleppo, Syria. U.S. Secretary of State John Kerry sharply criticized Syria\'s presidential vote this week as \"a great big zero,\" and said it can\'t be considered fair \"because you can\'t have an election where millions of your people don\'t even have an ability to vote.\"(AP Photo/Aleppo Media Center, AMC) (credit:ASSOCIATED PRESS)
Mideast Syria(20 of29)
Open Image ModalThis photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, shows smoke rising from a damaged building which was attacked by a government airstrike, in Aleppo, Syria, Tuesday June 3, 2014. Waving photos of their leader and dancing with flags, tens of thousands of Syrians pledged renewed allegiance to President Bashar Assad as they voted Tuesday across government-controlled parts of the country in a presidential election decried by the opposition as a charade. (AP Photo/Aleppo Media Center, AMC) (credit:ASSOCIATED PRESS)
Mideast Syria(21 of29)
Open Image ModalThis photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, shows buildings which were destroyed from a Syrian government airstrike in Aleppo, Syria, Saturday, May. 17, 2014. The United Nations chief has condemned a cut in water supplies in the northern Syrian city of Aleppo that he said has deprived at least 2.5 million people of access to potable water. (AP Photo/Aleppo Media Center AMC) (credit:ASSOCIATED PRESS)
Mideast Syria(22 of29)
Open Image ModalThis Sunday, April 27, 2014 photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, shows smoke rise from a Syrian government forces airstrike in Aleppo, Syria. Dozens of people were killed and wounded in fighting between pro-Assad forces and rebels in the northern city of Aleppo on Sunday, reported the Britain-based Syrian Observatory for Human Rights. The fight for Aleppo is particularly important now, with analysts saying they expect Assad\'s forces will try wrest as much of the city as possible before elections. (AP Photo/Aleppo Media Center AMC) (credit:ASSOCIATED PRESS)
Buildings destructed in clashes btw ISIL and armed group in Kobani(23 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 06: Buildings destroyed in clashes between armed groups and the Islamic State of Iraq and the Levant (ISIL) in Kobani (Ayn al-Arab) district of Aleppo, Syria on January 06, 2015. (Photo by Stringer/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Buildings destructed in clashes btw ISIL and armed group in Kobani(24 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 06: Buildings destroyed in clashes between armed groups and the Islamic State of Iraq and the Levant (ISIL) in Kobani (Ayn al-Arab) district of Aleppo, Syria on January 06, 2015. (Photo by Stringer/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Buildings destructed in clashes btw ISIL and armed group in Kobani(25 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 06: Buildings destroyed in clashes between armed groups and the Islamic State of Iraq and the Levant (ISIL) in Kobani (Ayn al-Arab) district of Aleppo, Syria on January 06, 2015. (Photo by Stringer/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Islamic Front members attack Assad regime forces near Aleppo(26 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 05: Islamic Front members take position as they clash with the Assad regime forces in the Majbal region of Aleppo, Syria on January 5, 2015. (Photo by Ahmed Hasan Ubeyd/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Islamic Front members attack Assad regime forces near Aleppo(27 of29)
Open Image ModalALEPPO, SYRIA - JANUARY 05: Islamic Front members take position as they clash with the Assad regime forces in the Majbal region of Aleppo, Syria on January 5, 2015. (Photo by Ahmed Hasan Ubeyd/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Syrians living in destroyed buildings hit by Regime Forces(28 of29)
Open Image ModalALEPPO, SYRIA - DECEMBER 24: A Syrian family lives in the debris of a destroyed building hit by the airstrikes of Assad Regime Forces in a neighborhood previously inhabited by around 200 families in Azaz district of Aleppo, Syria on December 24, 2014. (Photo by Orhan Cicek/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Syrians living in destroyed buildings hit by Regime Forces(29 of29)
Open Image ModalALEPPO, SYRIA - DECEMBER 24: Some Syrian families live in the debris of destroyed buildings hit by the airstrikes of Assad Regime Forces in a neighborhood previously inhabited by around 200 families in Azaz district of Aleppo, Syria on December 24, 2014. (Photo by Orhan Cicek/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)