Delays cleared around Union Station

Update 6pm: From the Post's Stephanie Lee: Police successfully talked the female down about 5:15 p.m., according to D.C. Police officer Hugh Carew. The first call about the situation came in to the police just before 3 p.m.

Update 5:55pm: H Street is reopened, a traffic camera shows... though, after a long day of incidents on the Hopscotch bridge, a Circulator bus appears broken down on it.

Original post: Police activity has played havoc with streets and train traffic around Union Station as, for hours, a woman has threatened to jump from the roof of the seven-story parking garage onto the tracks.

H Street Northeast near North Capitol Street is closed, and some MARC trains have been canceled. There may be problems on N. Capitol near the 800 block.

Negotiators are on scene and "we are standing by assisting the police and... making preparations" should something happen, said Fire/EMS spokesman Pete Piringer.

At 5:10, Liz Glover, owner of an H Street business, tweeted: "She stepped away from the ledge thanks be! My heart goes out to her."

Earlier, a bus caught fire on the same block.