A massive fire destroyed the Soundsphere factory on Research Drive in Stratford on Monday.

Firefighters from Stratford and crews from neighboring departments were called. Officials say the roof kept collapsing, which made it very difficult to the fight the flames.

A good portion of the factory, that assembles commercial speakers, has been demolished. It is unclear when the rest of the building will come down.

One worker was inside of the building, but made it out safely. Employees say five people work in the building.

Officials say there was some type of chemical reaction at the factory leading up to the fire.

Officials say they're working to get the debris removed so they can thoroughly investigate the cause.