HYATTSVILLE, Md. (WUSA) - No injuries were reported after three cars on Metro's Green Line derailed late Friday afternoon.

Metro spokesman Dan Stessel says the rail cars were at the rear of an inbound train, and that the approximately 60 passengers on the train were transferred to shuttle buses.

As of 11 p.m. Friday, Stessel said that Metro does not have the cause of the derailment but that officials are looking into the possibility of "heat kink" in the rails.

Friday, Metro said it would continue to provide a bus bridge to and from the West Hyattsville station through Friday night and possibly Saturday morning.

Here is the update on Metrorail travel in a Metro press release:

"All previously announced weekend track work has been cancelled for the weekend of July 6-8, 2012, due to a derailment Friday afternoon outside West Hyattsville Station on the Green Line.

There were no injuries, and the train was safely evacuated.

Due to ongoing track repairs outside West Hyattsville Station, free shuttle buses will replace trains between Fort Totten and Prince George's Plaza for the remainder of Friday, and possibly on Saturday and Sunday. Customers should check posted MetroAlerts for updated service information. Normal service will be restored in time for the Monday morning commute.

In addition, Metro has imposed a 35 mph speed restriction on all above-ground areas of the system through closing on Sunday. Due to the speed restriction, customers may experience delays of 10-15 mintues and should allow additional travel time.

On Friday, fire officials said a 26-year old pregnant woman was taken to the hospital, but that it was for precautionary reasons.

Prince George's County Fire Chief, Marc Brashoor said about 95 firefighters responded to the incident. Several dozen had to make their way into the tunnel to help evacuate the trapped riders.

Chief Brashoor said, "Our folks entered the tunnel from the station...physically walked down to the train, meet up with the conductor of the train...make sure they've had a face to face about where the patients are."

Metro says Green Line service was disrupted in both directions. Metro advised customers traveling to and from Nationals Park to consider using Capitol South Station on the Orange and Blue lines as an alternate to avoid Green Line delays.

All Metrorail trains in above-ground areas were slowed to 35 mph as a precaution.

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