Syria

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Syrians gather at the site of an explosion at Aleppo University in Aleppo, Syria, on Tuesday, Jan. 15, 2013. (AP Photo/SANA)

Smoke rises from buildings in Latakia, Syria, after heavy shelling on Monday, Jan. 14, 2012, in this image taken from video that has been authenticated based on its contents and other AP reporting. (AP Photo/Shaam News Network via AP video)

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Syrians run to aid the injured in the aftermath of a strike by Syrian government warplanes on the residential neighborhood of Maadamiyeh, south of Damascus, Syria, on Monday, Jan. 14, 2013. (AP Photo/Shaam News Network via AP video)

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A Free Syrian Army fighter aims his weapon in the Saif al-Dawlah neighborhood of Aleppo, Syria, on Sunday, Jan. 13, 2013. (AP Photo/Andoni Lubaki)

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United States Deputy Secretary of State William Burns (left) arrives Jan. 11, 2013, at the European headquarters of the United Nations in Geneva for a meeting with U.N. Joint Special Representative for Syria, Lakhdar Brahimi and Russian Deputy Foreign Minister Mikhail Bogdanov (both unseen) to find a politic solution for the crisis in Syria. (Associated Press)

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In this image taken from video obtained from the Shaam News Network, which has been authenticated based on its contents and other AP reporting, smoke rises due to heavy shelling in Taftanaz, in the Idlib province of northern Syria on Jan. 10, 2013. (Associated Press/Shaam News Network via AP video)

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**FILE** Syrians inspect the destruction of buildings on Jan. 5, 2013, after heavy shelling by the Syrian Air Force in apparent retaliation for rebel attacks on the nearby Taftanaz military airbase in the village of Binnish, Syria. (Associated Press)

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Syrian rebels gather around a fire as they plan patrols in the Saif al-Dawlah neighborhood of Aleppo, Syria, on Wednesday, Jan. 2, 2013. (AP Photo/Andoni Lubaki)