VALLEJO (CBS SF) — A three-alarm fire tore through an unoccupied commercial building in Vallejo early Sunday morning.

Crews arrived at the 16,000 square foot building in the 100 block of Corporate Place just before 5 a.m. and encountered heavy smoke and flames in the first two floors where a T-shirt and auto parts store had been housed, according to one Vallejo firefighter.

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“There was heavy fire from the first and second floor” of the 16,000 square foot building, which houses a T-shirt and auto parts store and a bankruptcy service, said Aaron Klauber, a firefighter and paramedic with the Vallejo Fire Department.

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Vallejo Fire

Early-morning fire at a commercial building on Corporate Pl. in Vallejo, Mar. 11, 2018.

The blaze was largely knocked down by 7:30 a.m. The cause of the fire is under investigation.

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No injuries were reported.