Employees noticed smoke coming from a vent in the ceiling and called 911, said Capt. Mike Lindbery, a spokesman for the Ventura County Fire Department.
About 70 employees had to leave the building.
could not apply water to the fire "because of the possibility of a violent reaction," Lindbery
said, and a hazardous materials team responded.
Ultimately, both sides of a duct in the ventilation system were sealed, and the fire was out by 11:05 a.m.
No one was injured.
The cause of the fire was not clear.
Fire personnel searched the building with a thermal imaging camera and other equipment and found elevated readings for carbon monoxide and other possible hazardous gases, but they were false readings, Lindbery
"These monitors require constant calibration, so it's not uncommon to get a false reading," Lindbery
who went inside the building were later hosed down as part of a decontamination process to make sure no hazardous materials entered their respiratory systems, Lindbery