Locals have been told to shut doors and windows as thick plumes of smoke billow from the blaze on Crowley Bridge Road. A wall has fallen onto an adjacent railway line stopping services, while fire crews also warned of “low hazard asbestos”. Emergency services were called to the blaze, on Crowley Bridge Road, at 10.42am on Saturday.
No-one has been injured in the blaze.
Inspector Lee Groves, of Devon and Cornwall Police, said: “We are currently treating this as a major incident and our colleagues at the fire services are working to contain and control the fire.
“A number of emergency services and other partner agencies remain at the scene.
“I urge the public to respect the cordons, not to put themselves in harm’s way and for nearby residents to keep all doors and windows shut due to the level of smoke.”
Devon and Somerset Fire and Rescue Service said 15 fire engines had been requested to deal with the blaze.
A spokesman said: “The whole building is fully involved in fire and there is low hazard asbestos involved, but fortunately there are no casualties.
“Fire crews are currently stopping fire spread to adjacent buildings.”
He described the incident as ongoing.