Firefighters have put out a blaze that burned for more than three hours at the headquarters of computer maker Apple.

The Santa Clara County Fire Department says the fire scorched the roof and the second level at one of the six buildings on the company’s northern California campus in Cupertino. It was put out early Wednesday morning and no one was injured.

Senior Communications Dispatcher Rafael Salcedo says the fire was “not very big, but there is going to be a lot of smoke damage.”