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Firefighters tackled another fire at the former MidKent College campus in Rochester on Sunday evening.
A large workshop on the City Way site went up in flames at about 6pm. It is believed about 50 firefighters were called out to battle the fire.
Crews from Medway, Strood, Thames-side and Chatham as well as a command unit and height vehicle were at the scene. An investigation into the cause of the blaze is taking place.
Last week, crews put their new PPV (Positive Pressure Ventilation) machines into use when a fire, which broke out in a former office on the site, filled the building with thick smoke.
On Sunday, an area of 100 sq ft was damaged in the fire and fire fighters were forced to use foam on the flames as an oil store was in the building.
It is suspected the fire was started deliberately and a spokesman for Kent Fire and Rescue Service said it was believed the building was not secured properly.
The campus has been closed since the summer when the college relocated to a new, purpose-built building on the Lower Lines in Gillingham. The old site is now owned by Bellway Homes.