Pupils are only allowed to consume food and drink from sealed containers in the wake of an incident in which milk bottles were filled with cleaning products at a Suffolk school.
Sally Esom, headteacher at Lakenheath Community Primary School, said steps have been taken to ensure any tampered-with food or drink products could not be consumed by pupils or staff.
It comes after two half-empty bottles of milk were left in fridges and were discovered by a member of staff on Monday, October 9 after being tampered with.
MORE- Milk bottles tampered with and filled with cleaning product at village primary school
Analysis of the bottles confirmed they were filled on the school premises with a cleaning product.
Miss Esom said: 'Additional safety measures have swiftly been introduced at the school to ensure that food and drink is only consumed from sealed packaging.
'We are supporting Suffolk Police in their investigation.'
No milk was given to any staff or pupils and no threats have been made.
The incident happened at some point between Friday, October 6 and the morning of Monday, October 9.
A spokesperson for Suffolk County Council said they were also helping the police with their enquiries.
The school has introduced additional security measures including adding locks to classroom fridges, and disposing of all unused and non-sealed produce daily.
Anyone who has any knowledge of the incident or witnessed any suspicious activity should contact Suffolk police on 101 quoting crime reference 37/66067/17.
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