A fire at a school and two attacks on people, including one by youths on horseback, has prompted a warning from Hastings police about antisocial behaviour.
Detective Sergeant Craig Vining says all three incidents during the weekend were serious.
A 19-year-old man, who was with his eight-year-old cousin, was attacked in Swansea Village, Flaxmere by three people in their early teens riding two horses about 11:30am on Saturday.
The man was kicked by the horses then the offenders climbed down and assaulted him further and stole goods.
Later in the day, in a separate incident, police arrested eight youths who allegedly attacked two men in Heretaunga Street West at 10:40pm. Some of them are expected to face charges in the Youth Court later this week.
The victim of the first attack had minor injuries and the two in the second required treatment in hospital.
Police are also investigating a second arson attack within a fortnight at Riverslea School in Mayfair, Hastings on Sunday.
It's believed three to four youths broke into the office, stole property, damaged a worm farm and set fire to several areas at the school.
Small kids in the Mayfair area approached police when we were going door-to-door, and many of them were upset that their school had been targeted, Det Sgt Vining said.