May 26, 2012: In this picture provided by the Syrian opposition's Shaam News Network, people watch the mass burial of victims in Houla. AFP/Getty Images hide caption

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A Free Syrian Army fighter fires his weapon during clashes with Syrian troops near Idlib, Syria, on Friday. The U.N. said Saturday it is suspending its mission in Syria because of escalating violence. Anonymous/AP hide caption

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A frame grab from a video taken by U.N. observers as smoke rose over the Syrian city of Homs earlier this week. The observers said Homs had been shelled by Syrian government forces. U.N. Supervision Mission in Syria hide caption

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A Syrian boy sits in the rubble of house destroyed during a military operation in April in the town of Taftanaz, Syria. AP hide caption

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