U.S. intelligence officials increasingly believe that the Ukrainian jet that fell from the sky after taking off from Tehran on Wednesday was shot down by a missile, according to two people familiar with the evidence. Ukraine International Airlines Flight 752 plunged from the sky minutes after a pre-dawn takeoff, killing all 176 people aboard. The Boeing Co. 737-800 was on fire as it plunged, according to witnesses on the ground and in other aircraft, according to a preliminary Iranian report on the crash. The U.S. government has obtained evidence indicating that the rapid descent was not the result of a mechanical ... (full story)