New York train crash eyewitness: 'We heard sirens'
1 December 2013 Last updated at 15:32 GMT
A passenger train has crashed in the Bronx area of New York City, and US media are reporting that at least four people have been killed.
Dozens are reported to have been injured as several of the Metro-North train's carriages came off the tracks.
Eyewitnesses, who live in the area, described the scene.