A federal investigator says there is indication of a link between today's New York commuter train derailment and the derailment of a freight train that occurred in the same location in July.
"We will be looking at that, but at this point, we have no indication that it's a factor," National Transportation Safety Board member Earl Weener said.
Mr Weener said investigators would be on the scene of the crash in the New York city borough of the Bronx for seven to 10 days.
More top news
A man standing trial accused of murdering two pensioners has been found hanging in his prison cell, police say.
Malaysia Airlines' website has been hacked by a group proclaiming support for the so-called Islamic State.
Prince Philip has been awarded a knighthood by Australia - sparking a political row in the country.