UNIVERSAL CITY, Calif.—Los Angeles County fire officials say a fire broke out at a building housing a closed theme park ride at Universal Studios.

Inspector Quvondo Johnson says reports of heavy smoke came in at 1:15 p.m. Wednesday from the theme park.

Johnson says the ride is under construction and the blaze may have resulted from a welding torch.

Firefighters have searched the three-story building and no one was found.