A rebel fighter fires a gun toward a building where Syrian troops loyal to President Bashar Assad are hiding, while they attempt to gain terrain against the rebels during heavy clashes in the Jedida district of Aleppo, Syria, on November 4, 2012. The uprising against Assad started with peaceful demonstrations in March last year, but has since morphed into a bloody civil war. Activists say more than 36,000 people have been killed in 19 months of fighting. #

A Syrian man wheels a woman severely injured from an artillery shell that landed near a bakery, to a hospital for treatment in Aleppo, on October 23, 2012. Several were killed and a dozen were injured after the artillery shell that landed near a bakery in Aleppo. #

A street of shattered buildings is viewed partially through a mirror used by rebel fighters to keep an eye on their enemy's positions in the Karm al-Jabel battlefield in Aleppo, on October 28, 2012. Syria's air force fired missiles and dropped barrel bombs on rebel strongholds while opposition fighters attacked regime positions, flouting a U.N.-backed cease-fire that was supposed to quiet fighting over a long holiday weekend but never took hold. #

(1 of 4) Free Syrian Army members fire on a man they suspect to be from the pro-government forces during a combing operation in Harem town, Idlib Governorate, on October 26, 2012. #

Syrian rescue workers evacuate a woman and her two children from a building targeted by a government forces air strike on the northern Syrian town of Al-Bab, 40 kilometers north-east of Aleppo, on November 4, 2012. An AFP correspondent reported three air strikes in close succession on Al-Bab. #

A Syrian rebel walks through a destroyed section of the Umayyad Mosque complex in the old city of Aleppo hours before the Syrian army retook control of it on October 14, 2012. Syria's army retook control of the historic mosque after fierce clashes with rebels in and around the area, a military official and the Syrian Observatory for Human Rights said. #

The body of a member of the Free Syrian Army, on the roof of a building after he was shot dead during fighting with pro-government forces in Harem town, on October 26, 2012. #

Two Syrian rebels take sniper positions in the heavily contested neighborhood of Karmal Jabl in central Aleppo, on October 18, 2012. Violence persisted with rebels and loyalists of President Bashar al-Assad locked in battle for the northwestern town of Maaret al-Numan on the Damascus-Aleppo highway linking Syria's two biggest cities. #

A Syrian rebel walks over spent cartridges at the Umayyad Mosque in the old city of Aleppo hours before the Syrian army retook control of the complex, on October 14, 2012. #

Damaged buildings in Syria's northern city of Aleppo, on October 12, 2012. Aleppo, a city of some 1.7 million people just 50 kilometers (30 miles) from the Turkish border, has been the key battleground of the 19-month conflict since mid-July. #

An apartment destroyed by tank shelling, in a building in the Karm al-Jabel neighborhood after several days of intense clashes between rebel fighters and the Syrian army in Aleppo, on October 28, 2012. #

A frightened child stands in the street after a Syrian government artillery shell destroyed his family home in the Shaar neighborhood of Aleppo, on October 13, 2012. Syria's army retook control on October 14, 2012, of a historic mosque in second city Aleppo after fierce clashes with rebels in and around the area, a military official and an observer group said. #

A crowd gathers in front of a building and car damaged after a bomb explosion in the Mezzeh 86 area in Damascus, on November 5, 2012. A bomb attack in a western district of Damascus killed 11 people and wounded dozens more, including children, on Monday, Syrian state media and an activist group reported. #

A shoe, glued to the mouth of a statue of late Syrian president Hafez al-Assad, at the museum of Maaret al-Numan, in Idlib province, an area under the control of rebel fighters, on October 17, 2012. #

Members of the Free Syrian Army take up a position during a truce on the top of a hilly mountain in the Kurdish area of al-Qaftal, overlooking the town of Azaz, on October 31, 2012. #

A rebel fighter prepares to throw a homemade grenade toward Syrian troops loyal to President Bashar Assad who are hiding in a nearby building in the Jedida district of Aleppo, on November 4, 2012. #

Rebel fighters belonging to the Liwa Al-Fatah keep an eye on an enemy position from a school building during skirmishes with the Syrian army in the nearby Bustan Al-Pasha front line in Aleppo, on October 30, 2012. #

(1 of 5) A Syrian civilian tries to escape the line-of-fire after he was targeted by a Syrian army sniper while walking near the frontline in the Bustan al-Qasr neighborhood of Aleppo, on October 20, 2012. #

(2 of 5) A Syrian civilian falls onto the street after being shot in his stomach while trying to escape a Syrian army sniper in the Bustan al-Qasr neighborhood of Aleppo, on October 20, 2012. #

(3 of 5) A Syrian civilian lies in the street in pain, shot in his stomach while trying to escape a Syrian army sniper in the Bustan al-Qasr neighborhood of Aleppo, on October 20, 2012. #

(4 of 5) Free Syrian Army fighters crawl on the sidewalk as they attempt to rescue a Syrian civilian who was shot twice, in his stomach and his back, by a Syrian army sniper in the Bustan al-Qasr neighborhood of Aleppo, on October 20, 2012. #

(5 of 5) Free Syrian Army fighters carry a civilian away from the line-of-fire after he was shot twice, in his stomach and back, by a Syrian army sniper while walking near the frontline in the Bustan al-Qasr neighborhood of Aleppo, on October 20, 2012. #

A pile of shoes covered by blood from wounded or dead residents lies at the entrance of the emergency ward at a hospital in the Tarik Al-Bab neighborhood in Aleppo, on November 1, 2012. #

A woman hugs her daughter who was injured in an explosion in Hai al-Wuroud, as they wait in a hospital in Damascus, on November 6, 2012. Bomb explosions killed at least 15 people and wounded dozens on Tuesday in a Damascus district populated mostly by members of Syrian President Bashar al-Assad's Alawite sect, opposition activists said. Syrian state media said an explosion hit the district of Hai al-Wuroud, in the northwest of the capital, causing an unspecified number of deaths and injuries. #

The body of a person (in purple) shot by a sniper from pro-government forces lies in a street in the Bustan al-Basha area as clashes continue with the Free Syrian Army in Aleppo, on November 2, 2012. #

A Syrian army fighter jet raids the northwestern town of Maaret al-Numan on October 19, 2012. Syrian jets hammered the rebel town on the second day of an assault in which the regime is accused of using cluster bombs, as peace envoy Lakhdar Brahimi landed in Damascus to press for a truce. #

Syrians who fled from the violence in their village walk between the tents at a camp for the displaced, in the Syrian village of Atmeh, near the Turkish border with Syria, on November 4, 2012. Most of the displaced people in the tent camp rising near this village on the Syrian-Turkish border are children. All have fled the violence of Syria's civil war further south. Many have seen violence themselves, some have lost relatives, and most have trouble sleeping and panic when they hear loud noises or airplanes, their parents say. The Atmeh camp was born of necessity about three months ago, say the local rebels who run the place, distributing tents and food aid provided by a smattering of aid organizations. #

Rawan Malek, 4, who fled with her family from the violence in their village, flashes the victory sign as she poses for a photograph inside a tent at a displaced camp, in the Syrian village of Atmeh, on November 7, 2012. #

In this frame grab from amateur video taken Thursday, November 1, 2012, and provided by the Syrian Observatory for Human Rights via AP video, captured soldiers lie on the ground in Saraqeb, northern Syria. Later in the video, alleged rebels appear to kill the group of captured soldiers, spraying them with bullets as they lie on the ground. This image from video has been authenticated based on the video and audio translated and content checked by regional experts against known locations and events, as well as being consistent with independent AP reporting. #

A mobile rebel unit moves through rebel-held streets with a truck mounted gun during heavy fighting with loyalists to President Bashar Assad who launched a coordinated attack on rebels using mortar, tank and aerial artillery in the Jedida district of Aleppo, on November 3, 2012. #

The burned interior of Kevork Church, after clashes between Free Syrian Army fighters and forces loyal to Syria's President Bashar al-Assad, at the al-Midan area in Aleppo, on October 30, 2012. #

A family member squeezes air into the lungs of an eight-year-old girl who was fatally wounded by a the machine gun of a Syrian government forces' jet at the Karm al-Aser neighborhood of eastern Aleppo, on October 31, 2012. #

Syrian people take cover as a second bomb explodes while civilians were undertaking a rescue attempt in a nearby building that was hit by a previous bomb during an air raid by government forces, on November 4, 2012, on the northern Syrian city of Al-Bab. An AFP correspondent reported three air strikes in close succession on the town of Al-Bab. #