A primary school teacher in Njoro, Nakuru has been arrested after he allegedly was busted having sex with one of his pupils in the school's staffroom.

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The pupil is a KCPE girl and the teacher reportedly lured her to the staffroom as other candidates did preparations for the exam on Friday morning.

His colleague busted him defiling the pupil and raised alarm.

The teacher has since been arrested and is waiting to be charged on Monday before Nakuru law court.

The girl was taken for medical treatment after the incident.