Pretty crazy story, apparently a man tried to kill himself by jumping in front of a Metro train at the Columbia Heights Metro. The station is now closed, so you'd better check WMATA's website if you're using it soon.
Here's WMATA's press release and their status page.
UPDATE: This happened earlier today, so apologies if you're just clicking over now from Twitter, the thing that publishes is very slow. The station is now open.
UPDATE 2: WTOP reports that the victim was a student at Bell Multicultural High School at 16th and Irving and has died. Onlookers say he was involved in a game of chicken, which is very sad and frankly very messed up.