U.N. Secretary-General Ban Ki-moon condemned the escalation of violence in Syria, saying reports of government warplanes bombing a Palestinian refugee camp are of "grave concern."
In this Saturday, Dec. 15, 2012 photo, Free Syrian Army fighters aim their weapons as they chant religious slogans during heavy clashes with government forces at a military academy besieged by the rebels north of Aleppo, Syria.
Syria, deaths from conflict, updated December 20, 2012
Syrian people seen near a damaged building after it was attacked by a Syrian Army Jet in Azaz, Syria, Sunday, Dec 16, 2012.
People near a damaged building after it was attacked by a Syrian Army jet in Azaz, Syria, December 16, 2012.