Firefighters battle 2-alarm fire in San Francisco

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San Francisco firefighters are investigating the cause of a two-alarm fire at a vacant building.

The fire department first tweeted about the fire Monday just after 5:00 a.m.

The fire was burning in the attic of a building at 451 Minna Street near Sixth Street, according to fire officials.

There is no information yet on what caused the fire.

Fire officials are advising people to avoid the area as firefighters work to put it out.