The incident took place at Dak Haripur Kanya Madhya Vidyalaya in Forebesganj on March 18, while results of UP election were announced on March 11.
When students and teachers were leaving the school on March 18, some BJP workers barged into the campus and hoisted the party's flag there to celebrate the party's victory in UP, the school's headmaster told District Education Officer Faizul Rahman.
The District Education Officer said he has instructed the Block Education Officer concerned to investigate the matter.
Action would be initiated based on the probe report, Rahman said.
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Araria district BJP president Babban Singh expressed regret over the incident and said it was caused by over-excitement of some local party workers.
Those party workers did not find a suitable place to hoist the party flag to celebrate the win and did it in the school, Singh told PTI.
The school is located around 35 km from Araria district headquarter.