Today its been declared a level three emergency and weve learned u. S. Forces landed on a moub mountain top. As weve been reporting, thousand of civilians are stranded there under threat by islamic fighters. It was less than a week ago u. S. Began humanitarian air drops and limited air strikes against icy targets. We begin tonight at the pentagon and jim miklaszewski. Good evening. Reporter good evening. Theres late word that those u. S. Forces have flown off the mountain and safely back at their base. But based on what they saw, the pentagon says a full blown rescue mission is now far less likely. For 24 hours two teams of u. S. Special forces were atop the sinjar mountain with thousands of yazidi refugees have been trapped, many dying of thirst or starvation. The heavily armed green berets were there to assess what it would take to complete a rescue mission, to get the refugees off the mountain in the safest way possible. U. S. Officials say early assessments are encouraging. Intelli