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NYC buildings collapse: 'Debris was flying everywhere'

12 March 2014 Last updated at 15:39 GMT

New York City emergency crews are responding to reports of an explosion and building collapse.

A man who was on a bus near the scene says he heard a "massive" explosion that shook the bus he was on.

Shane Kennedy told BBC News that the air was thick with smoke and ash, and he saw debris "flying everywhere".