By CBSLA Staff

LOS ANGELES (CBSLA) – Firefighters battled a large fire which broke out at a commercial building in Boyle Heights late Monday night and continued to burn for hours well into Tuesday morning.

A commercial fire burns in Boyle Heights, Calif., on Sept. 28, 2021. (CBSLA)

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The greater-alarm blaze in the 1600 block of East 1st Street broke out before 11:40 p.m. Monday, according to the Los Angeles Fire Department.

Crews arrived to find heavy flames coming from the one-story 50-foot by 100-foot building.

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Firefighters battled the fire for hours, with flames burning in deep pockets of the building that crews could not reach, LAFD reports.

The blaze caused portions of the building to collapse, and due to unsafe conditions, firefighters were forced to take a more defensive position.

There was no word of any injuries. The fire was still burning as of 4:30 a.m. Tuesday.

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LAFD arson investigators were on scene working to determine a cause.