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Washington, DC, firefighters load a victim into a medical bus after passengers on the Washington METRO (subway) service January 12, 2015, were injured when smoke filled the L'Enfant Plaza station during the rush hours. The L'Enfant Plaza metro station in downtown Washington was temporarily closed on Monday after a fire filled the station with smoke, the Washington Metropolitan Travel Authority said in a release. Metro Transit Police and fire department personnel were at the station examining the problem, WMATA said, but had not yet found the source of the problem. AFP PHOTO/PAUL J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Washington, DC, firefighters load a victim into a medical bus after passengers on the Washington METRO (subway) service January 12, 2015, were injured when smoke filled the L'Enfant Plaza station during the rush hours.   The L'Enfant Plaza metro station in downtown Washington was temporarily closed on Monday after a fire filled the station with smoke, the Washington Metropolitan Travel Authority said in a release. Metro Transit Police and fire department personnel were at the station examining the problem, WMATA said, but had not yet found the source of the problem.     AFP PHOTO/PAUL J. RICHARDS        (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)