A man has been arrested after a special school in Co Down sustained £30,000 worth of damage.
Both Knockevin Special School in Downpatrick and buses it uses to transport pupils were damaged in the incident.
The buses have been left unfit for use by the school.
The 23-year-old man has been arrested on suspicion of burglary in connection with the incident.
Police have appealed for anyone with information to contact them.
South Down MP Margaret Ritchie said those responsible for the damage were heartless and had shown a total disregard for the educational wellbeing of the vulnerable children who attended the school.
"This attack deprives the pupils of necessary facilities and places a heavy burden on an already overstretched education budget," said the SDLP representative.
"One hopes that the school environment can return to some normality as soon as possible.
"I commend the staff for all their hard work as they attempt to resume the school week. The parents of the young people who attend Knockevin will no doubt be upset at any disruption caused to their children's education.
"This attack represents not just an attack on the school, but also on the wider community. I would urge anyone who may have seen anything suspicious at the school over the weekend to come forward and help the police with their enquiries."