The parents of some 2,500 secondary school pupils have been told a major child protection inquiry is under way.
East Riding Council says it follows an allegation against a teacher last year.
After further allegations, other teachers are also now being investigated with one suspended earlier this month, the council says.
The teacher against whom the complaint last year was levelled - Ian Blott - has already been arrested and remanded in custody following a court appearance.
The local education authority says it has set up a confidential helpline for pupils.
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