Police were called to a school in Burgess Hill last night after reports of a break-in.
Officers, a dog unit, along with a police helicopter, were called to the special school in Chanctonbury Road after 10.30pm.
A spokesman for Sussex Police said: “Police were called to Woodlands Meed School in Chanctonbury Road, Burgess Hill, at 10.35pm on Thursday (August 23), following reports of four people breaking into the building.
“Officers and a dog unit attended the scene and they, along with the police helicopter, conducted a search but the suspects were not found.
“Officers have liaised with the school and it is unknown at this stage if anything was stolen.
“If you witnessed any suspicious behaviour in the area at this time please report online here or call 101 quoting reference 1542 of 23/08.”