Joint Commissioner of DB (North) Mohammad Rabiul Hossain Bhuiyan said a DB team from the Wari division detained Sabina Akter Tuhin early Monday from her village home in Nawabganj based on specific allegations.
She faces multiple cases involving corruption, incitement to political violence and conspiracy against the state, he added.
On Sunday evening, another DB team arrested Faisal Biplob from Monipuripara in connection with a murder case linked to the recent July movement.
According to DB officials, both Tuhin and Biplob had been under law enforcement surveillance as suspects in a recent incident of political violence and murder.
Faisal Biplob, in particular, is accused of playing a direct role during the violence related to the July movement last year.
A senior DMP official, seeking anonymity, said the arrests were made based on concrete evidence and case files, not for political harassment.
DB officials added that they would seek remand for interrogation and continue operations to detain others found involved during the investigation, reports UNB.