Update at 1:15 p.m. — Repairs were completed and normal service resumed before noon, Metro says.

Update at 9:45 a.m. — All Blue and Yellow line service between National Airport and the Pentagon has been suspended due to “unscheduled track repairs.” The Pentagon City and Crystal City stations are being evacuated, Blue and Yellow line service is being run in two separate segments, and a shuttle is being established.

Blue/Yellow Line: No trains btwn Nat'l Airport & Pentagon due to unscheduled track repairs at Pentagon City. Bus shuttle being established. — Metrorail Info (@Metrorailinfo) January 22, 2018

A large fire department response is on scene at the Pentagon City Metro station due to a track fire.

The apparent insulator fire is on one of the track at the station, producing light smoke. As of 9:15 a.m., the station was not being evacuated, but trains were being offloaded.

The Arlington County Police Department is helping to direct traffic in the area.

Trains are currently halted but Metro is preparing to single-track through the station, according to scanner traffic.

Metro caught fire at Pentagon City just now in front of me… in case anyone is wondering where your train is. #wmata pic.twitter.com/FcX3krnTaN — Jackie Barrientes (@JBarrientes_DC) January 22, 2018

Thanks @Metrorailinfo for the wonderful morning commute. Now stranded at Pentagon. Guess when the government shuts down you guys shut down too @unsuckdcmetro pic.twitter.com/wcc4PS6yqJ — Zachary Keefe (@darthzach7) January 22, 2018

Blue & Yellow line customers expect delays in both directions due to a track problem at Pentagon City. Some trains my offload and turn back for service. 9:09a #wmata — Metrorail Info (@Metrorailinfo) January 22, 2018