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3-alarm fire scorches Apple facility

Firefighters extinguish rooftop blaze Tuesday night at the company's Cupertino campus. Extent of the damage is not yet known.

A building at Apple's Cupertino, Calif., campus sustained unspecified damage overnight in a three-alarm fire.

Fire at Apple campus
Firefighters respond Tuesday night to a three-alarm blaze at Apple's Cupertino campus. KPIX

The blaze at the Valley Green 6 building, which appeared to have started under a ventilation and air-conditioning unit on the roof, was reported by workers at around 10 p.m. PDT Tuesday.

The location of the fire at the rooftop HVAC unit, where work was being done, offered a clue as the possible cause of the fire. "It lets us know it might have been an electrical issue, might have been a gas issue," Hal Rooney, deputy chief in the Santa Clara County Fire Department, told reporters on the scene Tuesday night.

No injuries were reported. About 66 firefighters were on hand to deal with the blaze, which was extinguished after about three hours.

Apple representatives were not immediately available for comment Wednesday morning.

San Francisco CBS affiliate KPIX has video from the scene Tuesday night, including Deputy Chief Rooney speaking and raw footage of fire crews at work.

Now playing: Watch this: Three-alarm fire at Apple

Deputy Chief Hal Rooney of the Santa Clara County
Fire Department describes the fire and its aftermath
at Apple's Cupertino, Calif., campus.