WHITTIER (CBSLA.com) — Firefighters Tuesday battled a three-alarm fire at a strip mall in Whittier.

READ MORE: Vehicle Crashes Into Restaurant Killing One, Injuring Five

The blaze, which started at a laundromat located at 15035 Leffingwell Road in the southern portion of the city, was reported at 3:15 a.m., the Los Angeles County Fire Department said.

It quickly spread to nearby businesses, engulfing the strip mall and causing the roof to collapse.

READ MORE: 3 Found Dead In Balboa Island Home

One firefighter suffered a minor injury, officials said.

The fire was knocked down at 5:24 a.m.

MORE NEWS: Drenching Rain Forces Alisal Fire Burn Area Residents In Santa Barbara County To Evacuate

The cause of the fire was under investigation.