Fire at south side Tucson duplex

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TUCSON, Ariz. -- A fire Thursday night at a south side duplex, near Irvington and 6th Avenue, not far from El Pueblo Park.

When Tucson fire crews showed up they found heavy smoke coming from the windows.

No one was home at the time, but firefighters found a dog at the door and helped revive him.

No word yet on a cause.