Second-alarm warehouse fire under investigation in Phoenix

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PHOENIX -- Fire investigators are trying to determine what sparked a two-alarm fire that raged through a Phoenix warehouse early Wednesday morning.

It happened at 22nd Avenue and Roosevelt Street.

Additional crews were called out because of the fire's size and because it was located in an industrial area that's surrounded by other large building.

Firefighters were able to keep the flames from spreading to other nearby warehouses.

According to crews on the scene, nobody was inside the burning building when the fire started.

No injuries were reported.

It's still not clear what started the fire.