New twist in Amtrak crash probe

Experts say they are unsure anything struck the windscreen of an Amtrak train minutes before a deadly derailment in Philadelphia, in another twist to the investigation as the national network restarted its service to New York.

The National Transportation Safety Board has not ruled out the possibility an object may have struck the windscreen but is not certain the train was hit at all before the May 12 derailment, which killed eight people and injured more than 200 others.