Dozens of firefighters respond to Mesa warehouse fire

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MESA -- Investigators are trying to determine what sparked a fire at a vacant warehouse in Mesa.

50 firefighters called out

Firefighters were called out to the building near Greenfield Road and Loop 202 at about 11:30 Sunday night.

More than 50 firefighters from three different departments responded after several drivers passing by called 911.

Because they knew the building was empty, firefighters took a defensive position.

No injuries were reported.

The cause of the fire is under investigation.