Early morning fire at Phoenix bar under investigation

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PHOENIX -- Investigators are trying to determine what sparked an early morning fire at a Phoenix bar.

Firefighters were called out to the Nu-Towne Saloon near 50th and Van Buren streets at about 4 a.m. Wednesday.

Crews had a hard time getting in to the building, but once inside, they were able to knock down the flames relatively quickly.

No injuries were reported.

No damage estimate was immediately available.

It's not yet known how the fire started.