The arrestee was identified as Rayhan Haque, 26, son of Haniful Haque.
Officer-in-Charge of Badarganj Police Station Habibur Rahman Hawladar said the victim's family was a tenant of Rayhan’s house in Ghulai area.
Rayhan raped the girl when she was alone in the house on Saturday night, he said.
Later, the victim's father filed a case with Badarganj Police Station over the matter, he added.
The girl has been sent to Rangpur Medical College and Hospital for a medical test, the OC said.
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