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Homemade grenades sit on a table on one of the battlefronts in Jobar, a suburb of Damascus, on February 22, 2014. (Reuters/Stringer)
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A soldier loyal to Syrian President Bashar al-Assad walks near corpses of dozens of rebel fighters in the area of Oteiba, whom Syrian state media and a monitoring group said were killed on February 26, 2014 in an army ambush at the entrance to an opposition stronghold in the Eastern Ghouta area. The Syrian army also seized the opposition fighters' weapons, the state TV channel said, using the term "terrorists" to refer to what is said were mainly non-Syrian rebels who belonged to Al-Nusra Front, an Al-Qaeda-linked group that has joined the armed revolt to topple President Bashar al-Assad. (Hassan Yussef/AFP/Getty Images)
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Khattab al-Halabi, a former tattoo artist who is now a Free Syrian Army fighter, poses with his weapon in at the Karm al-Jabal frontline in Aleppo on February 23, 2014. (Reuters/Jalal Al-Mamo)
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Residents try to cross the Assi River from Syria to Turkey, illegally, in Al-Hmazih village, on March 13, 2014. (Reuters/Fadi Mashan)
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Two Syrian men who fled from Yabroud, the last rebel stronghold in Syria's mountainous Qalamoun region, set up a tent in Wadi Hmaied between the Lebanese-Syrian border and the town of Arssal, in eastern Lebanon, on February 12, 2014. In Lebanon, preparations were underway to receive more Syrians fleeing the area. (AP Photo/Hussein Malla)
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Damaged buildings in the besieged area of Homs on December 24, 2013. (Reuters/Layth Homsi)
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A Free Syrian Army fighter inspects an unexploded shell in Jabal al-Akrad area in Syria's northwestern Latakia province on January 19, 2014. (Reuters/Alaa Khweled)
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Eyad, a 12 year-old boy who lost his arm during shelling by forces loyal to Syria's President Bashar al-Assad, tries on a prosthetic arm at Duma Charity Foundation for Prosthesis in the Duma neighborhood of Damascus on February 25, 2014. The center produces prostheses from different materials, including remnants of weapons, plastic mannequins and water barrels, and offers the devices to people who have lost their limbs during the war. (Reuters/Bassam Khabieh)
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Rebel fighters fire a heavy machine gun at the government forces Al-Samman checkpoint on a road leading to Idlib, near the Syrian city of Hama, on February 17, 2014. (Abu Hadi Al-Hamwi/AFP/Getty Images)
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In this photo provided by Aleppo Media Center (AMC), an anti-Bashar Assad activist group, which has been authenticated based on its contents and other AP reporting, a Syrian government forces helicopter drops what activists said are two barrel bombs over an area of Aleppo on February 2, 2014. For nearly two months, the Syrian government has conducted an intense air campaign on opposition-held districts of the northern city of Aleppo. (AP Photo/Aleppo Media Center, AMC, File)
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This 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, right, running for cover from a Syrian government forces airstrike attack in Aleppo on February 27, 2014. (AP Photo/Aleppo Media Center, AMC)
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This picture provided by the anti-government activist group Coordination Committee In Kfar Takharim, which has been authenticated based on its contents and other AP reporting, shows a Syrian man running as flames rise from buildings which were attacked by a Syrian government forces airstrike in the town of Kfar Takharim in the northwest province of Idlib, on March 1, 2014. (AP Photo/Coordination Committee In Kfar Takharim)
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Men carrying children run from a burning building following a barrel bomb attack reportedly dropped by government forces in the northern Syrian city of Aleppo on February 8, 2014. (Baraa Al-Halabi/AFP/Getty Images)
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A Syrian man breathes through an oxygen mask while awaiting rescue, trapped under rubble following an air strike by government forces on the Sahour neighborhood of Aleppo on March 6, 2014. (Khaled Khatib/AFP/Getty Images)
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Men hold up a baby saved from under rubble, who survived what activists say was an airstrike by forces loyal to Syrian President Bashar al-Assad in the Duma neighborhood of Damascus on January 7, 2014. The child, 27-day-old Rateb Malis, was later reunited with his father and sisters. (Reuters/Bassam Khabieh)
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A Syrian national flag flutters atop of a damaged building in a government-controlled district, as seen from a rebel-held area, in Aleppo's Karm al-Jabal district on March 17, 2014. (Reuters/Jalal Al-Mamo)
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Forces loyal to Syria's President Bashar al-Assad flash victory signs after advancing into al-Maasaraniyeh neighborhood in Aleppo on February 10, 2014. (Reuters/George Ourfalian)
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Flames rise from an explosion after opposition fighters hit a government forces tank in Khan Sheikhun, in the south of the Syria's northwestern Idlib province, on February 26, 2014. (Obaida Al-Shami/AFP/Getty Images)
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People inspect damage at a site hit by what activists said were barrel bombs dropped by forces loyal to President Bashar al-Assad in Aleppo's district of al-Sukari on March 7, 2014. (Reuters/Hosam Katan)
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A rebel fighter digs a tunnel in the eastern Syrian town of Deir Ezzor on March 13, 2014. (Ahmad Aboud/AFP/Getty Images)
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Debris covers a street and flames rise from a building following a reported air strike by Syrian government forces on March 7, 2014 during the Friday prayer in the Sukkari neighborhood of Aleppo. (Baraa Al-Halabi/AFP/Getty Images)
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A man digs graves, preparing for future casualties, in Arbeen, in the eastern Damascus suburb of Ghouta, on March 10, 2014. (Reuters/Yaseen al-Bushy)
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A Kurdish fighter from the Popular Protection Units carries his son as he walks along a street in Aleppo's Sheikh Maqsoud neighborhood on February 18, 2014.(Reuters/Hosam Katan)