A fire that ripped through a three-story row house on Rhode Island Avenue in Northwest left 18 people homeless.

The fire, which started at 10 Rhode Island Ave., spread to two adjacent homes early Monday morning. Officials said about 100 firefighters responded to the blaze after a neighbor called D.C. Fire and Emergency Medical Services around 5 a.m. saying there was a fire on the roof.

No one was injured.

Authorities are investigating the cause of the fire, but a fire department spokesman said they believe it was accidental. The residents of 10 Rhode Island Ave. had hosted a Fourth of July party on their rooftop deck.

The fire and smoke displaced six people from 10 Rhode Island Ave., seven residents from 8 Rhode Island Ave. and five from 12 Rhode Island Ave., officials said.

The blaze was quickly brought under control, the spokesman said. He estimated the damage at a "couple hundred thousand dollars."