Police were called to a village primary school after a boy pupil took a knife on to the premises.
Hart Primary School has moved to reassure parents after the incident and says pupil safety is a top priority.
It is important to stress that at no time did he brandish the knife or threaten anyone with itJo Heaton, Executive Headteacher
School staff called the police after they became aware the boy had the knife, which he took into school from home.
But it stressed that while a small number of pupils were made aware of it, the boy did not brandish the knife or threaten anybody with it.
Police have confirmed they are taking no further action and no crime has been committed.
Jo Heaton, executive headteacher at Hart Primary School, said: “I can confirm that a pupil did bring a knife into school from home, but it is important to stress that at no time did he brandish the knife or threaten anyone with it.
“The knife was concealed up the pupil’s sleeve and only a very small number of other pupils were made aware of its existence.
“We followed all appropriate protocols and procedures. We enjoy good links with Cleveland Police, and made them aware of the situation.
“I want to reassure parents that the safety and well-being of all pupils is a top priority of the school and all parents have been informed of the incident.”
The Mail was informed of the incident, which happened on Monday, by a concerned parent.
A Cleveland Police spokesman said: “Police were called by staff at Hart Village Primary School on Monday at around 2.40pm.
“They were reporting a pupil in possession of a knife. Staff isolated the child and removed the knife and officers attended the school and spoke with the child.
“There were no physical threats made by the child and it was determined that no criminal offences had been committed.
“There will be no further police action in relation to this incident.”