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."
ພາບຫລ້າສຸດ ຈາກຊີເຣຍ
![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.
![A Free Syrian Army fighter carries his weapon as he walks along a damaged street in Aleppo's Khan al-Wazeer district, Syria, December 16, 2012.](https://gdb.voanews.com/71098cb4-65a1-47d5-948a-05239fa14861_w1024_q10_s.jpg)
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A Free Syrian Army fighter carries his weapon as he walks along a damaged street in Aleppo's Khan al-Wazeer district, Syria, December 16, 2012.
![Free Syrian Army fighters pose with a tank after capturing the Military Infantry School following heavy clashes, Aleppo, Syria, December 16, 2012.](https://gdb.voanews.com/20e0e9cc-56d8-433b-b507-e62c6851b205_w1024_q10_s.jpg)
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Free Syrian Army fighters pose with a tank after capturing the Military Infantry School following heavy clashes, Aleppo, Syria, December 16, 2012.
![In this Saturday, Dec. 15, 2012 photo, Free Syrian Army fighters react after an explosion during heavy clashes with government forces at a military academy besieged by the rebels north of Aleppo, Syria. ](https://gdb.voanews.com/6bead7e2-cfc8-4d60-b587-16bda5a2cdfd_w1024_q10_s.jpg)
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In this Saturday, Dec. 15, 2012 photo, Free Syrian Army fighters react after an explosion during heavy clashes with government forces at a military academy besieged by the rebels north of Aleppo, Syria.