Kent Fire and Rescue Service and Kent Police were called to a fire in the former Laleham Gap school grounds in Cliftonville this morning (June 27).
Emergency services were called to the site in Northdown Park Road, at 1.39am.
The fire involved a disused portacabin on school grounds and was completely destroyed. The blaze had also spread, causing further damage to two further portacabins and an area of grass.
Fire crews wore breathing apparatus and used three main jets and a cold cut firefighting system to extinguish the blaze.
The incident was reduced to two fire engines just before 3am. They spent a further hour damping down and left the scene around 4.15am.