Detectives held father of Nurul Islam Marjan, one of the alleged masterminds of Gulshan terror attack that left 22 people killed.
People posing as members of Detective Branch picked Nizam Uddin up from Afuria village in Pabna on Monday evening, his relatives say.
But Pabna Police and Rapid Action Battalion (RAB) declined over detaining of Nizam Uddin.
Mohammad Rana and Sagar Hossain Rony, residents of the village, said they saw people identifying themselves as DB men picking Nizam up.
Marjan`s full name is Nurul Islam Marjan, former student of Chittagong University Arabic Department. He is fifth of his parents` five children of Hemayetpur village of Pabna Sadar.
Pabna Police Super Alamgir Kabir said no drive was conducted to detain Marjan`s father.