1 dead, 2 injured in 3-alarm fire in San Francisco, 3 homes impacted

One person is dead, and one civilian and one firefighter were injured in a massive, three-alarm fire that impacted three homes in San Francisco on Thursday, according to the San Francisco Fire Department.

"San Francisco Fire is saddened to announce that the previously listed unaccounted-for adult has been located within the fire building by Search K-9 Teams. This fire is now a fatal fire," the department tweeted.

The civilian is in serious condition and the firefighter is in stable condition, the department said.

Over 100 firefighters descended on the scene and the fire has since been contained, the department said.

One occupant was initially unaccounted for, San Francisco FireCapt.Jonathan Baxtersaid.

Some of the block was evacuated. The fire department is urging people to avoid the area.

"We are aware of the numerous calls and reports of an explosionand houses shaking in the area,"Baxter said.

There's no threat to the public, Baxter said.

The cause of the blaze is under investigation, the fire department said.