An updated version of this story can be read here.
To read witness accounts of the derailment's aftermath, click here.
For information about how to find out the status of family members, click here.
Four people are dead and dozens are injured after a Metro-North train headed for Grand Central Terminal derailed in the Bronx on Sunday morning, according to officials.
Eleven of the 67 people injured were in critical but stable condition, according police.
Five out of seven cars on a southbound train from Poughkeepsie, N.Y., derailed about 7:30 a.m. under the Henry Hudson Bridge, according to a Metropolitan Transportation Authority spokesman.
William Cullinane, 44, said a family friend named Cheryl was in the third car when it tipped over near the water.
"The train was tipping over and next thing you know everyone was on top of each other," Cheryl told Cullinane. Cheryl was traveling to visit the Empire State Building with two friends from Houston, Texas, when the derailment happened, according to Cullinane. She was being treated for bruises at New York-Presbyterian Hospital after the incident.
The train derailed on a large curved section of track about 100 yards from the Spuyten Duyvil station on the Hudson Line, the MTA spokesman said. The train was not scheduled to make a stop at the station.
Between 100 and 150 passengers were on the train, according to Gov. Andrew Cuomo.
The cause of the derailment will be under investigation, officials said. A team from the National Transportation Safety Board was dispatched to the scene.
The MTA spokesman said that while the head cars derailed, none are in the Hudson or Harlem rivers, which are adjacent to the tracks.
Police and fire departments were at the scene, officials said.
It is unknown if any of the train's crew members are injured.
The train left Poughkeepsie about 5:54 a.m.
Service between Croton-Harmon station and Grand Central is temporarily suspended. Amtrak service between Albany and New York city was restored with extensive delays after being suspended for several hours.
Shuttle buses will be provided between Tarry Town and White Plains on the White Plains line for customers traveling to Grand Central.
Officials have established JFK High School at 99 Terrace View Ave. in the Bronx as a family center. To find out the status of anyone who might have been on the train, call 718-817-7444 or 311.
Follow Anna Sanders on Twitter: @AnnaESanders