Police arrested two suspected rapists, including a Jubo League leader, at Baraipara village in Hatibandha upazila of the district on Friday.
Another alleged rapist and Jubo League leader managed to flee the area, said Mansur Ali, officer-in-charge of Patgram Police Station. The OC, however, did not mention the suspect's name.
The arrestees are Nazrul Islam Nazu, 42, of Baraipara ward unit Jubo League Secretary Nurnabi Islam, 35, of Patgram upazila.
A 30-year-old garment worker was locked inside the room of a bus counter and gang-raped multiple times for four days in Patgram, police said.
She was rescued by police and sent to a hospital on Thursday afternoon. A case was filed against four suspects.
Soon afterwards, police arrested Rezaul Karim, 34, who is the general secretary of Burimari union Jubo League.
The OC said the suspects arrested on Friday were hiding in a village home when they got caught in a raid.
The 30-year-old worker of a Dhaka garment factory went to Patgram after one of the suspects promised the woman of finding her a job in India and told her to go there.
When she was held captive, the suspects said they would kill her unless she kept quiet, the woman told police.