A soldier from the Syrian government forces walks past severely damaged buildings in the northern Syrian city of Aleppo, Sept.3, 2014.
Several historic buildings, including a colonial-era structure, have been blown up in Syria's second city of Aleppo, where fighting has wrought massive destruction, reports said.
Sobhi al-Hamod, 60, lives with his family in an underground cave in Idlib province, Syria, Feb. 28, 2013.
A Syrian refugee passes a playground at the Jordanian-run Al Bashabsheh refugee camp in Ramtha, Jordan, July 17, 2012.
This citizen journalism image provided by Shaam News Network, taken on July 24, 2012, purports to show a helicopter gunship flying a bombing run in al-Qalmoun, Syria.
A Free Syrian Army soldier steps on a carpet with the photo of Syrian President Bashar Assad at the border town of Azaz, some 20 miles north of Aleppo, Syria, July 24, 2012. Turkey sealed its border with Syria to trucks on July 25, cutting off a vital supply line to the embattled nation as fighting stretched into its fifth day in the commercial capital of Aleppo.
A rebel fighter makes improvised mortar shells inside a weapons factory in the southern countryside of Idlib September 9, 2014.
A rebel sniper aims at a Syrian army position in a residential building in the Jedida district of Aleppo, Syria, Oct. 29, 2012.
Injured Syrian women arrive at a field hospital after an air strike hit their homes in the town of Azaz, on the outskirts of Aleppo, Syria, Aug. 15, 2012.
A Syrian man cries outside the Dar El Shifa hospital in Aleppo, Syria, after his daughter was injured during a Syrian Air Force strike over a school where hundreds of refugees had taken shelter, Oct. 4, 2012.
A wounded Syrian civilian lies in the street with a shot to his stomach as he 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, Syria, Oct. 20, 2012.
A Free Syrian Army soldier looks through a mirror that helps him see Syrian troops from the other side, during fighting in Aleppo, Syria, Sept. 24, 2012.
A Syrian rebel stands next to a flaming tire while firing at a Syrian army checkpoint in a suburb of Damascus, Syria, March 17, 2012.
Aida cries as she recovers from severe injuries after the Syrian Army shelled her house in Idlib, north Syria, March 10, 2012. Aida's husband and two of her children were killed.
Two Israeli-Druze women watch from the Israeli side of the Israel-Syria ceasefire line in Golan Heights, as smoke rises where Syrian rebels and regime forces clashed, June 6, 2013.
Syrian rebels briefly seized the only crossing along the Israel-Syria ceasefire line before regime forces recaptured it using tanks, an AFP correspondent and Israeli sources said.
Homemade weapons were left by Syrian rebels after the army seized total control of the city of Qusayr and the surrounding region in Syria's central Homs province, June 5, 2013.
The Syrian army ousted rebels from the strategic town of Qusayr after a blistering 17-day assault led by Hezbollah fighters, scoring a major battlefield success in a war that has killed at least 94,000 people.
The bodies of people killed in an alleged "poisonous gas" attack are seen in a makeshift morgue in the eastern Ghouta suburbs of Damascus, in an image taken from unverified video posted by an opposition group on YouTube, Aug. 21, 2013.
Anti-government fighters from the Islamic Front engage Syrian army forces in a fire fight near the town of Mleiha, a suburb to the southeast of Damascus, in a video posted online, Aug. 14, 2014.
A civil defence member is stuck under debris at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in the Al-Shaar neighbourhood of Aleppo, July 27, 2014.
Civil defence members look for survivors at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in the Al-Shaar neighbourhood of Aleppo, July 27, 2014.
A Syrian man carries the body of a child on a heavily damaged street following a reported air strike by government forces on July 9, 2014, in the northern city of Aleppo.
ISIS loyalists wave ISIS flags as they drive around Syrian city of Raqqa, June 29, 2014
As many as a thousand different opposition groups are fighting to bring down the government of Syrian President Bashar Assad.
A Free Syrian Army sniper sits in a shooting position in Old Aleppo, June 7, 2014.
Free Syrian Army fighters take position during clashes with forces loyal to Syria's President Bashar al-Assad in Sheikh Najjar in Aleppo, May 13, 2014.
Forces loyal to Syria's President Bashar al-Assad play football at al-Hamdeya neighborhood in Homs city May 9,2014.
Around 270 Syrian rebels granted safe exit under a complex deal with President Bashar al-Assad's forces are being held in Homs by the army after insurgents elsewhere failed to uphold their side of the agreement, Syrian officials said on Friday. Following a year of siege, around 1,200 rebels and residents in the Old City of Homs left the city on buses this week in exchange for the release of dozens of captives held by rebels in the northern provinces of Aleppo and Latakia.
Syrian men ride a motobike past the remain of a building on August 1, 2013, in front of Saint Elie Church that was damaged during the clashes between Syrian regime forces and rebels fighters in the city of Qusayr, in Syria's central Homs province.