However, after initial help in the arrests, neither the state police nor the NIA could make any headway in the case, they said.
The NIA, which was being assisted by the state police, was unable to prepare sketches of Sajid and another suspected Bangladeshi national Nasirullah who is also believed to have managed to escape.
During their visit to Bangladesh, the NIA team will seek information about Sajid and Nasirullah, the sources said. The two people arrested from Assam could only give some information about the incident which included claims that Improvised Explosive Devices (IEDs) could have been smuggled into Bangladesh.
However, they could not provide any information about how the explosives were transported. Besides Sajid, Nasirullah and Kausar, cash rewards have been announced for Talha Sheikh and Maulana Yusuf Sheikh, Amjad Ali Sheikh, Habibur Rahman Sheikh, Sahanur Alom, Abdul Kalam, Burhan Sheikh, Rejaul Karim and Jahirul Shaikh.
During interrogation, Razira Biwi, Alina Biwi and Badrul Aalam spoke about the process of selecting hideouts, fabricating IEDs besides identifying, recruiting and indoctrinating youths from various madrasas, the sources said.
The arrested people also reportedly told interrogators that plans were afoot to create a terror network in West Bengal and Assam to build an Islamic state in Bangladesh as well as in the three West Bengal districts—Murshidabad, Nadia, Malda—through armed struggle.
Latest India News