A tutor brought in to improve pupils’ behaviour was filmed feeding a wild rat near the school kitchens.
Paul Ashworth, a member of staff at Springwell Community College in Chesterfield, is being investigated.
Pest control experts were also called in.
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Janet Senior and Josie Howarth, who run a donkey sanctuary in Knottingley, were just 15 feet away when Salman Abedi detonated the bomb.
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