More than 100 firefighters knocked down a major emergency blaze at a vacant former supermarket in Sun Valley Thursday morning.

Crews responded at 3:11 a.m. to 8025 North Vineland Ave., said Margaret Stewart of the Los Angeles Fire Department.

A knockdown was declared an hour and 35 minutes later, she said.

No injuries were reported.

The large building, built in 1958, is more than 80,000 square feet in size.

The scene was expected to remain active for the duration of the morning, and the public was advised to avoid the area if possible.

Per protocol for an incident of this size, LAFD’s Arson Section was called and listed the cause of the fire as “undetermined” after an investigation.

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