Police picked up a Rohingya woman from Bonarapra Bazar in Saghata upazila of the district yesterday.
The detainee is Sabitri Singha, 55, wife of late Mohon Singha. She speaks in Myanmar language.
Seeing her suspicious movement, locals informed police who later detained Sabitri from the area around 11:00am.
She will be sent to Rohingya camp in Teknaf under police protection, said Masrukur Rahman Khaled, superintending of police in Gaibandha.