Firefighters knocked down a contents fire in a warehouse Sunday in El Sereno.

The blaze inside the one-story building at 4900 E. Valley Blvd. was reported at 9:17 p.m., said Los Angeles Fire Department spokesman Nicholas Prange.

The fire caused the warehouse to fill up with smoke, he said.

The department dispatched 81 firefighters to the scene and extinguished the flames in just over 30 minutes, Prange said.

No injuries were reported and the cause of the fire remained under investigation.

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