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."
Images from Syria
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A Syrian refugee crosses illegally to Turkey on the border fence, Cilvegozu, Turkey, December 20, 2012.
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A Free Syrian Army fighter, whose comrades are surrounding a military airport, reads the Quran, Aleppo, Syria, December 20, 2012.
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People near a damaged building after it was attacked by a Syrian Army jet in Azaz, Syria, December 16, 2012.
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Damaged buildings are seen in Al-Khalidiya neighborhood of Homs, Syria, December 16, 2012.