How the NTSB is analyzing evidence from the D.C. plane crash
Investigators with the National Transportation Safety Board are using parts of the wreckage from the deadly plane-helicopter collision in Washington, D.C., to begin to understand what happened. CBS News' Kris Van Cleave reports.
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Investigators with the National Transportation Safety Board are using parts of the wreckage from the deadly plane-helicopter collision in Washington, D.C., to begin to understand what happened. CBS News' Kris Van Cleave reports.
