A forklift has sparked a fire on the 11th floor of Seattle's old Municipal Building, the second time the building has caught fire in less than a month.

Fire fighters extinguished the November 7 blaze quickly, and no one was injured, but the cause of the fire had not been determined, according to an Associated Press report.

The roof of the building, which is being demolished, caught fire on October 14 after workers used a cutting torch.