The L.A. County Sheriff's Arson and Explosives Detail was investigating the apartment fire that injured three people at North Crescent Heights and West Sunset Boulevard, the sheriff's Headquarters Bureau announced Friday evening.
The fire was reported at 9:47 a.m. March 22 in a seven-story building at 1424 N. Crescent Heights Blvd. and fire was coming from a third-story window, LAFD spokeswoman Katherine Main said.
More than 60 firefighters, including Los Angeles County Fire personnel, responded, Main said. The fire was declared knocked down in less than 20 minutes.
Paramedics transported three patients from the scene, Los Angeles County fire Inspector Quvondo Johnson said.
West Hollywood Station patrol deputies also responded to the fire, Headquarters Bureau personnel said.
"The cause of the fire is undetermined at this time," their statement said. "The investigation by the Los Angeles County Sheriff's Department Arson and Explosives Detail is ongoing."
Celebrity website TMZ.com reported the unit was the home of 26-year-old "Twilight" actress Ashley Greene, who also starred in the TV series "Pan Am."
Marilyn Monroe and Rock Hudson also lived in the same historic building, known as Granville Towers, ABC7 reported.