Holes in Iran plane crash wreckage raise new questions

Iranian authorities say the crew of a Ukrainian airliner that crashed in Tehran never called for help. They say according to an early crash report, the plane was trying to turn back when it went down, leaving a trail of wreckage in a field on the outskirts of the city. But Kris Van Cleave reports that holes found in that wreckage are leading some to question the idea that the plane had mechanical issues.