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LIVE VIDEO: NTSB gives briefing on Metro North train derailment

The NTSB holds a press conference about a Metro North passenger train that derailed in New York City, killing at least four.

Emergency personnel respond to the scene of a Metro-North passenger train derailment in the Bronx borough of New York on Dec. 1, 2013.
Emergency personnel respond to the scene of a Metro-North passenger train derailment in the Bronx borough of New York on Dec. 1, 2013.AP
By  MS NOW staff

MS NOW staff