UPDATE 3:43 p.m.: The fire is mostly under control, but there are still major concerns about the site.

The structural integrity of the building involved in the 2nd alarm fire on Chillum Place NW continues to be of concern. Heavy equipment is en route to mitigate further impact to @CSX and @wmata rails and red-line commuters. pic.twitter.com/ysilVmLNA6

— DC Fire and EMS (@dcfireems) May 10, 2018 UPDATE 10:37 a.m.: Extraordinary new video from D.C. Fire and EMS shows just how close the fire is to the Metro tracks. The video behind our request to have @wmata single track just feet from the 2 Alarm Fire we continue to fight on Chillum Place, NW. We need to ensure the safety and well being of our commuters. pic.twitter.com/3BtimryKIX

— DC Fire and EMS (@dcfireems) May 10, 2018 (Updated 9:38 a.m. Thursday): WASHINGTON, D.C. — Firefighters continue to put out a blaze at a Takoma warehouse after 13 hours. The warehouse is adjacent to Metro tracks, causing the Red Line to single track Thursday between Takoma and Fort Totten.

The two-alarm fire started at about 3:15 p.m. in the 6500 block of Chillum Place, NW. It's still going as of Thursday morning, D.C. fire officials said. The two-story warehouse belonged to a home building company. Nearby businesses were forced to evacuate, officials said.

One firefighter was transported to the hospital with minor injuries. Deputy Fire Chief of Special Operations John Donnelly said Thursday morning that firefighters are continuing to put out hot spots that remain from the fire yesterday.

"A number of businesses have been impacted by a pretty immense fire response," D.C. Mayor Muriel Bowser said. "We are grateful to our firefighters for arriving immediately and getting this fire under control, and the proximity to the train tracks and their ability to put this fire down so we can get the Metro back open on this span is also very important. We appreciate everybody being patient. The safety of our firefighters, of course, is paramount getting this fire put down and forbidding any more loss to property."

Chillum Place 2nd Alarm update. Partial roof collapse with heavy fire now venting thru the roof. We continue to maintain a collapse zone and maintain a defensive stance. pic.twitter.com/0NNs3kceL2

— DC Fire and EMS (@dcfireems) May 10, 2018 >> This is a developing story. Patch will update this post as more information becomes available.