The Kelambakkam police arrested a 27-year-old person for sexually assaulting a minor on Wednesday. The police said K. Krishnan, a resident of Rajeshwari Nagar in Kelambakkam, impregnated a minor girl from the same locality in August on the pretext of marrying her. Once the pregnancy came to light, the girl’s mother filed a police complaint, based on which Krishnan was arrested and booked under two sections of the Protection of Children Against Sexual Offences (POCSO) Act. He was produced before a judicial magistrate and sent to prison.