According to the Los Angeles County Fire Department, crews were called to what was reported as a 2-alarm fire just before 9 a.m. at the building located in the 200 block of W Avenue L.
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The fire department said the fire quickly spread from the facility - where it originated - to trucks and trailers that were sitting nearby.
A total of 25 UPS trucks and 10 tractor trailers were damaged, according to authorities. A spokesperson for the fire department said some UPS units were in the process of being loaded and unloaded.
AIR7HD: Footage shows multiple UPS trucks destroyed after fire
One person was sent to the hospital with a minor burn injury, though it's unclear if he or she was a UPS worker.
The fire department said 25 workers were safely evacuated from the building as 75 firefighters worked to put out the fire. Authorities believe Monday's strong winds may have caused the blaze to spread.
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Video sent to Eyewitness News by a viewer showed a huge plume of black smoke that could be seen rising from a distance.
The cause of the fire remains unknown.
UPS has since released the following statement:
"We are cooperating with local authorities on the scene but do not have additional information to share at this time."