Fire near Penn Station affecting A, E and C trains

An early morning fire near Penn Station is affecting subway service in the area.

Authorities say A, E and C trains are bypassing the 34th Street station.

Fire officials say the 3-alarm fire broke out at 2:20 A.M. Tuesday in an underground construction site at 34th Street and Eighth Avenue. They say it was nearly under control around 5 a.m.

A fire department spokesman says firefighters are still at the scene monitoring and extinguishing pockets of fire.

Two firefighters suffered minor injuries and were transported to a hospital.

Police say Eighth Avenue is closed between 31st and 34th streets.

Fire officials are investigating the cause of the fire, which they have labeled "suspicious."

More than 150 firefighters battled the three-alarm fire that took over two levels of a construction site by the west end of the LIRR concourse at Penn Station, located at West 33rd Street and Eighth Avenue in Manhattan, FDNY Chief James Leonard said.

DC's Metro on reduced schedule following accident

Separately, Washington's Metro subway system will operate on a modified and reduced schedule following an accident that killed one passenger and sent dozens to hospitals with smoke inhalation.

Metro says the yellow line won't operate Tuesday morning. It was a yellow line train that was evacuated after smoke filled a tunnel near the busy L'Enfant Plaza station Tuesday afternoon.

In addition, trains will run less often Tuesday morning on the blue, orange and silver lines. The green line, which goes through L'Enfant Plaza, will be on a normal schedule, as will the red line.

The fatality on board the train on Monday was the first on the Metrorail system since a crash between two trains in 2009 that killed eight passengers and a train operator.

NBC News contributed to this report.