7:10 p.m. Update: Metro says the problem has been resolved but expect delays to continue.

Original post: A fire on the Orange Line near East Falls Church Station is causing delays on the Orange Line in both directions.

Trains are single-tracking between East Falls Church and West Falls Church stations.

Post staffer Brian Kuhta reports that he could see Metro workers equipped with fire extinguishers headed to the front of a train at East Falls Church, where the train had just been offloaded.