Three of the victims of the Metro-North train derailment were "ejected from the train", according to ABC News.
New York Governor Andrew Cuomo said the "train's operator had survived the crash" and was receiving treatment for "unspecified injuries".
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Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.