A mentally challenged minor girl was allegedly raped at Taltala village in suburb of Satkhira town.
Police arrested the alleged rapist, Sajedul Islam, 19, son of Intaj Ali of the village.
The victim's father said Sajedul took the girl, 9, to his residence when she was alone at their house on Monday evening and violated her there. Later, he kept her beneath the cot almost in an unconscious condition.
Neighbours informed the victim's father after hearing her groaning from the house of Sajedul.
She was rescued from beneath the cot and taken to Sadar Hospital for autopsy, said officer-in-charge of Sadar Police Station Mostafizur Rahman, reports UNB.
He also said they arrested the rapist and sent the victim to hospital for medical test.
The victim's father filed a case over the incident.