Source: http://www.nbcwashington.com/

One woman is dead, dozens of other people were hospitalized, and three remain in critical condition after the upper level of the L'Enfant Plaza Metro station in southeast D.C. filled with smoke Monday afternoon.
Transportation Alternatives to Metro
A Virginia-bound Yellow Line train was in the tunnel just south of the station around 3:20 p.m. when it stopped for unknown reasons.

Read more: http://www.nbcwashington.com/traffic/transit/LEnfant-Plaza-Metro-Station-Closed-Due-to-Smoke-288309501.html

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Anyone?