Singleton Heights Public School was the subject of the alleged break-and-enter which caused significant damage to the school's facilities.

Families were notified on Monday morning that due to the disruption there would be minimal supervision available at the school, and were urged to keep students at home for the day.

The Primary Cross Country and Year 2 Swim School were postponed until Tuesday, and the Singleton Height's PSSA Netball game against Denman Public School due to be held this Tuesday was pushed back to a later date, to be announced.

The school's canteen was ransacked, with all fridge and freezer stock destroyed, forcing it to remain closed until staff are able to order new food.

Singleton Heights Principal Shaun Graham confirmed the school would be operational on Tuesday despite the adjustments as staff get their plans in order.

Police attended the scene on Monday morning to undergo forensic tests and investigations are continuing.

Staff were unable to clean the mess until police examinations had concluded, causing significant disruptions to teaching.

It's not the first time the school has been ransacked, with cash and computer equipment stolen and facilities significantly damaged in August last year. At the time there was no CCTV on site.

Nearby, Allan Bull Reserve is also closed to the public due to extensive damage caused by vandals over the weekend.

Singleton Council has advised the facility will remain closed until further notice and repairs are completed.

Any one with any information about either incident is urged to contact Singleton Police 65787416 or Crime Stoppers: 1800 333 000 or https://nsw.crimestoppers.com.au

More to come.