FREMONT (CBS SF) — Firefighters in Fremont have knocked down a fire at the Tesla factory Tuesday afternoon that left two people hospitalized due to smoke inhalation, according to authorities.

The Fremont Fire Department units responded to a report of a fire at the Tesla facility located at 45500 Fremont Boulevard at 12:41 p.m.

READ MORE: Body of Missing Stanford Nurse Found in Fremont

The Fremont Fire Department tweeted that the fire was extinguished at approximately 1:20 p.m. and was isolated to a boiler room on the 3rd floor of the administration building.

READ MORE: UPDATE: 4 Minors Arrested In Connection with Shooting in Hillsdale Mall Parking Lot

Fire officials said the large filters for the HVAC system caught on fire. Firefighters are in the process of clearing the smoke from the building and checking for extension.

Two people at the facility sustained injuries from smoke inhalation and have been transported to area hospitals for treatment, fire officials said.

MORE NEWS: UPDATE: Police Shoot, Kill Armed Suspect Outside International Terminal at SFO

The cause of the fire is under investigation.