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