Four Bangladeshi nationals, among others, were charged for their involvement in the Burdwan blast in Kolkata.
Quoting the statement of National Investigation Agency (NIA) of India Kolkata-based Bangla daily Anandabazar reports that the main purpose of the militants was to carry out violence in Bangladesh after receiving training at various states in India.
While citing the press statement of the NIA, NDTV reports the chargesheet has been filed against the accused "for their involvement in the conspiracy of Jamaat-ul-Mujahideen (Bangladesh) (JMB), a proscribed terrorist organisation in Bangladesh, to overthrow the existing democratic government in Bangladesh through violent terrorist acts and replace it with a hard-line Sharia based Islamic rule, which came to light after the accidental blast."
More than six months after an explosion in a house in West Bengal's Burdwan district, NIA on Monday formally charged 21 people, including four Bangladeshis, for their involvement in the blast, reports The Times of India in its online version on Monday.
The charge-sheet was filed in front of a NIA special court in Kolkata.
NDTV also reports the NIA claims the terrorist outfit, JMB, has established its network in the states of West Bengal, Assam and Jharkhand. "Its activities in India primarily included recruitment, radicalisation and training of vulnerable youth in a systematic and organised manner," said the agency.
The NIA further alleges, "A network of terrorist training camps at selected madrasas and other hideouts was found to be in operation."
During the investigation, the investigating agency has examined more than 250 witnesses and conducted around 100 searches across the states of West Bengal, Assam and Jharkhand.
Testimonies gathered by the NIA provide details about the alleged bomb-making unit in the house, and sequence of events leading up to the explosion.
The accused have been charged under various sections of the law relating to offences of terrorism, conspiracy, recruitment, funding, running terrorist training camps, possession of arms and explosives, forgery and offences related to foreigners act and passport act.
Two people were killed in the blast that took place in a house at Khagragarh in Bengal's Burdwan district on October 2.
Initially assumed to be a gas cylinder blast or explosion of crude bombs, investigations later revealed that the two people who were killed were using fairly sophisticated IEDs or Improvised Explosive Devices.
Probing the blast, the NIA has so far arrested 18 people from various parts of the country as well as Dhaka in Bangladesh.
As many as 15 people suspected to be involved in the case are missing and on the run.
The NIA took over the probe a few days after the explosion.