A reader reports “People running like crazy”. More info as soon as it’s known.

No confirmation but possible shots fired.

Update from MPD:

“NO Active Shooter at Union Station. Investigation underway. More to follow.”

Update from the comments:

“according to my office mate who was there getting lunch: guy with a knife started stabbing someone near the McDonalds, the SEC security guards shot him.”

and

“I was there eating lunch. Screams and everyone started running for the doors. From what I heard from law enforcement that it was domestic (between a couple) and security did the shooting.”

Update from Metro Transit Police:

“Union Station – Police activity inside Amtrak portion of station is not affecting Metro ops. Red Line service operating normally #wmata”