Firefighters and emergency medical services personnel responded to the scene of an Amtrak train derailment at Union Station on Tuesday morning.
Two cars derailed but were still upright and positioned inside the tunnel just before the station.
D.C. Fire and EMS said firefighters were aboard the train and communicating with passengers. One person was being evaluated by EMS, but there were no other reported injuries.
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Amtrak said that trains operating between the nation's capital and Alexandria, Virginia, were stopped due to the disabled train that is "blocking the tracks south of Washington."
"Rail service in and out of Washington is currently impacted. Delays are expected. We will update as more information becomes available," it said.
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The derailment was reported at around 9 a.m. ET, according to FOX 5 D.C.
This is a developing story. Please check back for updates.