A Thursday night fire in Southeast D.C. has displaced 20 people. One person is in the hospital with what the fire department is calling critical injuries.

WASHINGTON — At least 20 people have been displaced, and one person has what’s being described as critical injuries, after a Thursday-night apartment fire in Southeast D.C.

D.C. Fire and EMS responded to the fire at around 8 p.m. in the 3400 block of Minnesota Avenue.

Update working fire 3400 block Minn. Ave SE. 1 victim transported with critical life threatening injs. Additional patients being assessed. Fire extended to 2nd floor. #DCsBravest have all fire knocked down. pic.twitter.com/pZUVLm3hB1 — DC Fire and EMS (@dcfireems) April 26, 2018

The fire started on the first floor of the 12-unit building and extended to the second floor.

A woman was rescued from the unit where the fire started and was taken to the hospital with what the fire department called critical injuries. Another resident was taken to the hospital for observation.

Officials are still investigating what caused the fire.

Working fire update 3400 block Minn. Ave SE. Fire under control. Investigators on scene actively searching for cause. All occupants of 12 unit building displaced & @RedCrossNCR requested. Scene below early on in battle. pic.twitter.com/noNA6Tv9X1 — DC Fire and EMS (@dcfireems) April 26, 2018