The Centre on Friday handed over the the Burdwan blast case to the National Investigation Agency (NIA).
Two suspected terrorists were killed and another sustained injuries in an explosion at a Trinamool Congress (TMC) leader’s house in Khagragarh in Burdwan town from where grenades, rocket launchers, bomb making equipment and ‘jihadi’ documents were found on October 2.
The CID said they were associated with Jamat-ul-Mujahideen of Bangladesh and other militant organisations.
The investigators are trying to find where the explosives recovered from the Khagragarh house were supposed to be sent.
Four persons, including two women, have been arrested in connection with the blast.
Sheikh Hakim alias Hasan Saheb from Lalgola in Murshidabad district, who was injured in the blast, was arrested. Hafez Mollah alias Hasan, Rajira Bibi alias Rumi, widow of the suspected terriost Shakil Ahmed who died in the blast and Amina Bibi, Hasan Saheb’s wife, were also arrested.