In addition to the Arlington County Police Department, WMATA spokesman Dan Stessel says Transit Police were on the scene investigating the report of a suspicious male subject aboard an inbound train.
Few details are being released right now, but police scanner traffic first indicated the suspect may have lit WD-40 on fire inside the Ballston Metro station or inside a Metrorail car. Scanner traffic also indicates police are interviewing Metro employees at the East Falls Church station, where reports suggest the suspect may have gotten off the train.