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The incident came to light when the girl narrated her ordeal to her parents after returning from school yesterday, a police official said.
The accused, identified as Ram Asre (37), has been working in the school for around a month and is a permanent electrician employed with the NDMC, the police said.
He has been arrested and a case has been registered against him under the relevant section of the IPC and under the Protection of Children from Sexual Offences (POCSO) Act, they said.