A group of six youths caused criminal damage at a derelict building in St Clements Road in Keynsham at around 6pm on Sunday 13th August.
A witness heard the sound of smashing glass understood to be coming from the old Treetops care home and called out to the offenders, who ran off. They were described as white and aged in their early teens.
A larger group of youths returned to the same area about 30 minutes later although it is unsure if they caused any more damage or if the previous group was responsible for all of it.
Anyone with information, especially CCTV images, is asked call 101 or Crimestoppers anonymously on 0800 555 111.