Firefighters battled a blaze Wednesday morning that caused a partial roof collapse while it gutted a strip mall in San Gabriel.
The fire was reported about 6 a.m. near the intersection of Valley Boulevard and New Avenue.
Arriving firefighters initially planned an offensive attack against the blaze, San Gabriel Fire Department spokesperson Mark Stafford said at the scene.
Crews eventually discovered that it was an attic space fire, which Stafford said was difficult to attack.
Aerial video from Sky5 showed flames burning through the roof of the engulfed Valley and New Center strip mall.
Firefighters eventually ended up in a defensive mode while battling the blaze. Stafford said.
At one point, firefighters were on top of the structure when a portion of the roof collapsed.
No injuries were reported, and all firefighters were accounted for following the collapse, Stafford said.
The strip mall housed six businesses, including five restaurants and an optometrist.
All of the business were a total loss.
More than 80 firefighters eventually gained control of the fire and extinguished the flames.
An investigation is underway to determine the cause of the fire.