U.S. believes Ukraine airliner accidentally brought down by Iran -officials

A Ukraine airliner that crashed in Iran, killing all 176 people aboard, was most likely brought down accidentally by Iranian air defenses, U.S. officials said on Thursday.

One U.S. official said U.S. satellites had detected the launch of two missiles shortly before the plane crashed, followed by evidence of an explosion. Two officials said Washington believed the downing of the plane was accidental.

The Pentagon declined to comment.