It's believed work is being carried out at the former home of Christopher Halliwell.
Cheltenham: Appeal After Arson Attacks
Police are investigating three arson attacks in Cheltenham, which have left cars and trees damaged.
They say the first happened at about 3am on Sunday, March 16, when four pine trees were set alight in the car park of Cambray Court.
The heat from the fire also caused damage to several cars.
A bin fire was also discovered in nearby Rodney Road.
Around 4am, a hedge was also damaged at a property in Coltham Road.
Police say they are linking the first two incidents and are also investigating whether these are related to a third on the same night.
During this, somebody had tried to set fire to a garden shed and an outhouse in Cirencester Road.
Officers are asking witnesses or anyone with information to call 101 , quoting incident number 72
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