JERUSALEM — Syrian rebels on Wednesday took 20 United Nations peacekeepers hostage in the Golan Heights, demanding that the U.N. and the United States do more to force Syrian President Bashar Assad to withdraw his troops from a village in the area in return for the hostages’ release. “If no withdrawal is made within 24 hours we will treat them as prisoners,” a video posted online by a group that identified itself as the Martyrs of Yarmouk said. The video showed U.N vehicles and an armored patrol car. At least two U.N. officials wearing blue helmets and flak jackets could be seen in the background. It was the second incident this week in which rebel forces deliberately sought to internationalize their fight to topple Assad. On Monday, gunmen believed to be either members of the rebel Nusra Front or the related group al Qaida in Iraq attacked an Iraqi military convoy deep inside Iraq as it was escorting a group of unarmed Syrian civilians and soldiers. As many as 50 Syrians and a dozen
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