An early morning four-alarm fire has left a Somerville condominium uninhabitable, displacing 23 residents, according to Somerville firefighters and the American Red Cross.
The fire was discovered around 5 a.m. at 106 Walnut St., which was built in 1920 and currently comprises six condo units, according to Somerville assessment records. The fire appears to have started in the basement, Somerville Fire Chief Kevin Kelleher said. It took firefighters about two hours to knock down the fire.
The Red Cross had volunteers on the scene. No one appears to be injured, Kelleher said.
The cause of the fire is under investigation.