Parents of students at Badulla Girls' Tamil School held a demonstration on Monday to protest against the degrading treatment of the school principal by the Uva chief minister.
The chief minister, Chamara Sampath Dassanayake forced the principal of Badulla Tamil Girls' School to kneel before him and apologise for allegedly disregarding an order he had issued.
Parents marched from the school gates to Badulla town centre, calling for the arrest of the chief minister.
The teachers' trade unions and Ceylon Teachers Union have demanded that Mr Dassanayake be arrested for the degarding way he treated the principal, threatening island wide protests if action is not taken.
Following the outcry, the Sri Lankan president, Maithripala Sirisena announced on Sunday he had ordered an investigation into the incident.
Mr Dassanayake said he would resign from the post of provincial council education minister until the investigation was over.