Washington---Smoke filled a Washington subway station Monday, forcing the evacuation of startled passengers and forcing afternoon rush-hour commuters to find other ways to get home.
Service along sections of two of Metro's six lines were suspended as police and firefighters converged on underground L'Enfant Plaza station in the heart of the US capital.
"The source of the smoke has not been determined. The station has been evacuated and is temporarily closed at this time," Metro said in a statement.
On Twitter, Washington's fire department said six people had been taken to local hospitals, including one individual with unspecified "serious injuries."
L'Enfant Plaza is two stops away from Federal Triangle where a major water main break on December 16 brought trains on three lines to a halt during morning rush hour.
Metro is the second-busiest mass transit system in the United States after the New York subway.
It suffered its worst incident in June 2009, when one train slammed into the rear of a second train that had come to a stop. Nine people were killed and more than 70 injured.
AFP