Twenty one fires, set in rapid succession in the Hollywood area, have prompted authorities in California to post a $60,000 reward in what they say is one of the worst arson spree in recent memory.
In almost every case, the fires were started on parked cars within a span of about five hours early Friday morning, officials said.
Some spread to nearby buildings.
Among the homes damaged was one that was once occupied by Doors frontman Jim Morrison. The street where the house sits - Rothdell Trail - was the inspiration for the Doors song, "Love Street."
Seventeen fires were set in Hollywood; four others in West Hollywood - all of them within a 2-square mile area.
Fire officials said they were relieved no one was hurt, although a firefighter suffered a non-life threatening injury.
"If you're setting something alight when people are going to bed, you obviously don't expect them to wake up," resident Mark Todd told CNN affiliate KTLA. "It sort of goes past arson to attempted murder."
The Hollywood area is home to about 20,000 people per square mile, said Los Angeles fire spokesman Erik Scott.
And the fires caused $350,000 in property damage - a "conservative estimate," he said.
County Supervisor Zev Yaroslavsky told reporters Friday afternoon that authorities are "dead serious about trying to apprehend the individual or individuals who are responsible for this."
"We want to get these SOBs before they hurt somebody," he said.FULL STORY