The Hindustan Times on Monday reported that two Bangladeshis—Shamim Shakil Ahmed and Svopan Mondal, who were allegedly making bombs, were killed in a grenade explosion at a house in Burdwan town of West Bengal on October 2.
The men and rest of the group were members of banned Islamist outfit Jamaat-ul-Mujahideen Bangladesh (JMB), Hindustan Times said.
Rumi Bibi, whose husband Shamim Shakil Ahmed died in the blast with Svopan Mondal, told security agencies that in the last three months they had sent four consignments of bombs to Bangladesh through couriers, who she named as Kausar and Rasiq.
The bombs they were making were not meant for attacks in India, Rumi Bibi added.
Hindustan Times reported that top Indian intelligence officials had passed on the information to Bangladesh's top intelligence agency, the National Security Intelligence (NSI), and the country's Director General of Forces Intelligence (DGFI) in Dhaka.
India has alerted Bangladesh regarding bombs being assembled in a house in West Bengal were meant for terror strikes in Bangladesh, Hindustan Times said.
The report said Rumi and Ameena Bibi, whose husband Abdul Hakim was injured in the blast, were held on Thursday but were arrested on Sunday morning.
Hakim is being treated at Burdwan Medical College Hospital and had refused to cooperate, the daily said.
Security agencies, with the help of local police, on Sunday conducted raids on at least three places in West Bengal to nab JMB cadres. They were also looking for a Murshidabad-based "religious motivator", the newspaper said.
The daily said the police and security agencies also interrogated Mondal's wife Akina, house-owner Hassan Choudhury and Ameena. Ameena's father, who lives in Murshidabad, had fought the "gram panchayet" elections on the ruling Trinamool Congress ticket but lost to the CPM candidate.
Twenty-five hand grenades, some 10 ready-for-use improvised explosive devices (IEDs) and large quantities of ammonium nitrate, iron oxide, hydrogen peroxide and other chemicals used in making explosives were recovered from the spot, the daily said.