Fire crews battled a blaze early Monday at a commercial building in Huntington Park.
The fire was at a building in the 6700 block of Alameda Street. Smoke was visible from the 110 Freeway during the morning commute.
The fire started at about 5:30 a.m. Alameda Street is closed between Florence Avenue and Gage Avenue. At about 11 a.m., fire officials said flames in the building still prevented firefighters from entering the structure.
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"We've tripled the original amount of resources since the fire began," said Capt. Mark Savage. "It just wasn't safe to have our firefighters charge in. Our priority, obviously, is firefighter safety. We need to become aware of what hazards might be involved with this facility."
Savage said his crews talked with people who are familiar with what might be inside the building before firefighters were allowed to enter the structure.
The building houses a food processing plant called Windsor Foods. Fire officials said one of the combustible elements in the fire was soy bean oil.
"Anytime a fire burns through the roof, it's extremely dangerous for firefighters" because of the threat of collapse, said Los Angeles County Fire Inspector Don Kunitomi
About 150 firefighters were at the location, said county fire Inspector Matt Levesque.