We would like to reassure people that this has been an isolated incident and there is no ongoing risk to pupils or staff at the school.
The situation is under control and officers, including safer schools officers and members of the local neighbourhood policing team, are currently at the school and are liaising closely with staff. The rest of the school is continuing to operate as normal and we would ask that parents do not attend the site unless directly requested to do so by the school.
Our enquiries are at a very early stage but the full circumstances of this incident will obviously be the subject of a full and thorough investigation."
More top news
What does the weekend weather have in store for us?
Labour Party have voted for Dan Jarvis to run for Sheffield Mayor
Thieves who tried to steal a cash machine in a ram raid were thwarted after crashing the ATM into a parked car.