Changing tactics of terror groups have security forces on tenterhooks The arrest of three Jamaat-ul-Mujahideen Bangladesh (JMB) terrorists from Haridevpur in South Kolkata followed by several arrests and their subsequent interrogation | 26 July 2021 3:44 AM GMT KOLKATA: The arrest of three Jamaat-ul-Mujahideen Bangladesh (JMB) terrorists from Haridevpur in South Kolkata followed by several arrests and their subsequent interrogation has led the police to believe that the militants coming from or through Bangladesh are not following the traditional patterns of operation. They are adopting new methods and mechanisms which are helping them to avoid security surveillance and expand their organisation. West Bengal, which shares 2,217 km of the total 4096 km border with