The accident in Rajshahi’s Paba Upazila leaves two other motorcyclists injured
Chittagong Metropolitan Police Commissioner Abdul Jalil Mandal told a press conference on Saturday that they were arrested from the port city and Kishoreganj since the murder on May 7.
Those arrested have been identified as Mohammad Sagar, Mohammad Mahbubul, Gias Uddin and Mazharul Islam Arif.
Mandal said they confessed to the murder.
The weapon used for the murder, blood stained clothes and the mobile-phone of the guard were found with them.
Mohammad Ibrahim was slaughtered during a robbery attempt at the bank’s Muradpur branch.
The bank’s senior officer Ali Newaz filed a case with Panchlaish police. Detective Branch was given the charge of the investigation later.