The police dived at a Liverpool basic school last week after an 11-year-old girl got a kitchen knife while playing with friends.
Officers of the MerseSide police investigate after the weapon, which is said to be removed from the girl's house, was found at the Lingham Primary School, Wirral on March 25.
A group of girls had played when one of them brought the knife forward, it was reported.
The school later became aware of the incident and the police were called around 2.20 pm.
When officers were present, the knife was established and it was confirmed that no one had been injured.
The Merseyside police said that 'appropriate security measures' were taken.
Police officers of Merseyside examine the weapon, which is said to be taken from the girl's house, was found at Lingham Primary School, Wirral on March 25
Wirral Local Policing Chief Inspector Dave Morgan said: 'We understand the concern that such incidents can cause, especially at one of our junior schools.
'Officers stay in contact with the school and our partners to reassure students, parents, carers and staff.
“In the meantime, if you have information about young people wearing weapons, come forward.”
The staff of Lingham Primary School has confirmed that there was an incident on 25 March.
The MerseSide police asked someone with information about young people who wore weapons to contact them via @merpolcc on X, 101 or via crimestoppers anonymous on 0800 555 111.
Lingham Primary School is contacted for comment.
