The Intelligence Bureau says that this could be retaliatory in nature as the NIA had busted a major module. It is also a way of saying that the JMB was down but not out.
Amjad (30), a resident of Birbhum in West Bengal, carried a reward of Rs.10 lakh on his head.He was arrested by NIA on Monday.
The NIA camp office, situated in the Bidhannagar area in the suburb of the city, is also being used to interrogate Sajid, the mastermind of the Burdwan blast, and other arrested suspects in the blast.
According to officials of Bidhanagar Police Commisionarte "intial investigation has shown that at around 7.30 in the evening, two crude bombs were thrown when a car was passing by the camp office area."
A team of the state's detective agency has been rushed to the spot. A team of the state bomb experts also rushed to the spot to inspect the kind of the materials used to trigger the blast.
According to officials of the Electronic Complex Police station, no casualties or injury took place. Debasish Dhar, Aditional Commissioner of Police, Bidhannagar Police Commissionerate, said police are suspecting that the material used could be a firecracker.
"We are not taking it lightly. A police team has rushed to the spot to inquire into the nature of the explosive material," Dhar said.
National Investigation Agency (NIA) had last month found nearly 40 improvised explosive devices linked to Burdwan blast suspects. West Bengal police and NIA together achieved two major break-throughs in the past three days by arresting top commanders of Jamaat-ul-Mujahideen Bangladeh (JMB) including Sajid on Saturday and Amjad Sheikh today.
(With PTI inputs)