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.

“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.

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.

No injuries were reported.