A smoke inhalation victim receives oxygen after passengers on the Metro (subway) service were injured when smoke filled the L'Enfant Plaza station during the evening rush hour January 12, 2015 in Washington, DC. Smoke filled the Washington subway station, forcing the evacuation of startled passengers and forcing afternoon rush-hour commuters to find other ways to get home. "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. Metro is the second-busiest mass transit system in the United States after the New York subway. AFP PHOTO / PAUL J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP via Getty Images)
