A Free Syrian Army fighter aims his weapon during heavy clashes with government forces in Aleppo, Syria, December 11, 2012.

Syrian residents carry their belongings after their homes were damaged due to fighting between Free Syrian Army fighters and government forces in Aleppo, Syria, December 11, 2012.

A woman and girl carry their belongings after their home was damaged in fighting between Free Syrian Army fighters and government forces in Aleppo, Syria, December 11, 2012.

Free Syrian Army fighters warm themselves by a fire in Aleppo's al-Amereya district, December 11, 2012.

Free Syrian Army fighters look for government forces during heavy clashes in Aleppo, Syria, December 11, 2012.

This image taken from video obtained from the Shaam News Network shows what was said to be heavy shelling by warplanes near Damascus, Syria, December 10, 2012.

People shop at a market near buildings damaged in heavy fighting between Free Syrian Army fighters and government forces in Aleppo, Syria, December 9, 2012.

People wait in line to buy bread at a bakery in Aleppo, Syria, December 9, 2012.

Men use a fire to boil water near their tent at a refugee camp near the Turkish border, in Azaz, Syria, December 9, 2012.

General view of a refugee camp near the Turkish border, in Azaz, Syria, December 9, 2012.