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
![A Syrian refugee crosses illegally to Turkey on the border fence, Cilvegozu, Turkey, December 20, 2012.](https://gdb.voanews.com/4BE9BE5E-9501-421F-B382-6F50127C2120_w1024_q10_s.jpg)
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A Syrian refugee crosses illegally to Turkey on the border fence, Cilvegozu, Turkey, December 20, 2012.
![A Free Syrian Army fighter, whose comrades are surrounding a military airport, reads the Quran, Aleppo, Syria, December 20, 2012.](https://gdb.voanews.com/12DEE097-8DF2-4210-B549-91C87F2C412D_w1024_q10_s.jpg)
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A Free Syrian Army fighter, whose comrades are surrounding a military airport, reads the Quran, Aleppo, Syria, December 20, 2012.
![People near a damaged building after it was attacked by a Syrian Army jet in Azaz, Syria, December 16, 2012.](https://gdb.voanews.com/9848594C-1548-4351-A2EC-8517A85B6FEF_w1024_q10_s.jpg)
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People near a damaged building after it was attacked by a Syrian Army jet in Azaz, Syria, December 16, 2012.
![Damaged buildings are seen in Al-Khalidiya neighborhood of Homs, Syria, December 16, 2012.](https://gdb.voanews.com/6AB2FED4-0E27-4FBF-9B34-472849724089_w1024_q10_s.jpg)
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Damaged buildings are seen in Al-Khalidiya neighborhood of Homs, Syria, December 16, 2012.