Firefighters were battling a blaze at Apple’s Cupertino for more than three hours late yesterday. The fire damaged the second level of one of Apple’s six buildings and apparently reached the rood as well. According to the Santa Clara County Fire Department, the fire was contained within two and a half hours and most of the damage is limited to smoke damage. No one was injured.

The cause of the fire has not been determined. However, the Santa Clara County Fire Department said that the fire may have started in the area of an air conditioning unit on the second floor of the building.