UPDATE 3:49 p.m. Traffic is moving again on K Street NW. Police have concluded their preliminary investigation, moved the van out of the street, and cleared the area.

UPDATE 3:12 p.m.: K Street remains closed between 17th & 18th Streets NW. Police are still on the scene conducting a search of the man’s vehicle, which is a U-Haul van.

UPDATE: WUSA9 has a few more details now, including that the guy apparently threw a couple of Molotov cocktails while he was up on the van. Also note that the intersection remains closed while police investigate.

Police got there and were trying to get him off of the van until DC Fire got there with a step ladder. At that point, DC Police got on top of the van and were able to convince the man to come down.

At this time, the intersection is still closed down as officials investigate the van and make sure there is nothing harmful inside of it.

DCist reader Thad A. was kind enough to send in this photo of the single protester who managed to stop traffic at 17th and K Streets NW for a short while today. His signage indicates he’s demanding “Justice” and “$200 million” – anyone who was down there hear him explain that any further? Was this a bailout-related outburst, or more of a personal financial crisis?

We hear the guy was moved out of the way a little while ago, so traffic should hopefully return to normal on K Street shortly. MPD and D.C. Fire/EMS are still on the scene trying to restore order.