A case has been registered against two police constables in Maharashtra's Nagpur district for allegedly robbing a student after threatening to book him and his girlfriend for obscene acts, an official said on Monday, reported news agency PTI.

Based on a complaint, the police had earlier registered a case against unidentified persons posing as policemen, but a probe revealed that two constables attached to Kalamna police station were involved in the incident that occurred on April 13, the official from Wathoda police station said.