Two occupants of a Logan Circle rowhouse and a firefighter were injured Thursday morning when a fire swept through part of a three-story rowhouse in Northwest Washington.

None of the injuries were thought to be life-threatening. A fire department spokesman said one resident jumped from a second-floor window and was taken to a hospital with a broken leg. Another resident was found inside suffering from burns.

Firefighters battle a blaze Thursday at a Logan Circle rowhouse. (D.C. Fire and EMS/D.C. Fire and EMS)

The firefighter fell through a floor inside the rowhouse and was slightly injured, the department said. The firefighter declined to go to a hospital.

Doug Buchanan, spokesman for the D.C. Fire and Emergency Medical Services Department, said the fire was reported shortly before 7 a.m. in the 1200 block of Rhode Island Avenue NW, on the east side of Logan Circle near Vermont Avenue.

Buchanan said a cause remains under investigation but investigators believe it was accidentally set. The spokesman said firefighters found hoarding conditions in some parts of the rowhouse.

The fire quickly went to two alarms, drawing more than 50 firefighters to the scene and forcing authorities to shut down Logan Circle and two blocks of Rhode Island Avenue. Bus service was running 30 minutes late in the area and closures slowed the morning commute. The roads and circle remained shut as of 8:30 a.m., after the fire had been declared under control.

The fire began in the first floor of the rowhouse, but quickly spread. Buchanan said firefighters were ordered to vacate the building and continued fighting the fire from the outside. There was water and smoke damage to a neighboring rowhouse, he said.