Three staff fell ill the day before school evacuation

The SFRS said no hazardous substances have been found in their investigation.

The council said there has been no evidence of gas leaks. Tests for carbon monoxide and carbon dioxide were also carried out along with checks on the gas, water and electricity supplies.

A specialist firm has been contracted to carry out further investigations and the kitchen will remain closed while this happens.

Packed lunches will be provided to pupils until the kitchen re-opens and they will be taken in classrooms rather than the dining area.

Sheena Devlin, children and families spokeswoman for Perth and Kinross Council, said: “This has been a very difficult week for pupils and staff and I would like to thank them, and parents and carers, for the way they have responded this week.

“Following extensive testing and consultation with partners and NHS Tayside, we will re-open to pupils on Monday.

“However, we have appointed a specialist company to carry out a forensic check of the kitchen and its appliances to make sure everything is working exactly as it should so our staff, pupils and wider school community can have absolute peace of mind.”