Washington (CNN) One passenger died after smoke filled the L'Enfant Plaza metro station in downtown Washington on Monday afternoon, a Washington Metropolitan Area Transit Authority spokeswoman told CNN. A total of 84 people were treated by local hospitals, according to emergency officials.

Metro Box Alarm Update: 84pts. transported to area hospitals with various injuries. Over 200 people evaluated.1 firefighter injured. — DC Fire and EMS (@dcfireems) January 13, 2015

The station was temporarily closed after filling with smoke, while a disabled train was evacuated. D.C. Fire and EMS tweeted that one person was critically injured and six others were hurt in the incident after a train filled with smoke and its passengers were evacuated.

The National Transportation and Safety Board released a statement saying "an electrical arcing event" sparked the incident.

"There was an electrical arcing event involving the trackside power cables (the third rail)," said a statement from the NTSB's Peter Knudson.

A six-car Yellow line train was southbound from L'Enfant station when sparks were noticed about 1,100 feet in front of the train as the tunnel filed with smoke.

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