Members of Rapid Action Battalion (RAB) on Saturday night arrested an alleged kingpin Sento Sarder along with his three cohorts while conducting drives in Gazipur and Ashulia area in Savar.
The detainees are accused of multiple cases, said RAB-4 sources at a press conference in Nabinagar camp under Saveron Sunday noon.
The rest arrestees are Jasim Uddin, hailed from Dinajpur district, Rabbi Ahmed, inhabitant of Sunamganj district and Johirul Islam, a resident of Tangail district.
"The culprits brought Arif Hossain to Kaltashiti area in Ashulia by force and strangled him to death for ransom," RAB sources said, adding that Arif went to Sentu, who is an inhabitant Rajshahi district, for a job at a garment factory.
The arrested persons have been committing such heinous crime for three to four years in this area, the sources mentioned.