Terror outfit Jamaat-ul-Mujahideen Bangladesh (JMB) has set up a base in Assam of India, Director General of Police Khagen Sharma has said.
Sharma also claimed that some people from the state are undergoing training and maintaining links with the group.
The top police official came up with the claims on the sidelines of a police event in Assam on Tuesday, reports PTI, the Indian state-run news agency.
After the October 2 explosion at Khagragarh in West Bengal's Burdwan district, Assam police had conducted raids at various places and kept some people under surveillance in the state, the DGP told reporters.
Sharma said with the arrest of six JMB linkmen from Barpeta district after the Burdwan blast and surveillance, the police had evidence of a sleeper cell of JMB in the state.
JMB was trying to spread here while concentrating its presence in Lower and Central Assam as well as the Barak Valley, which is along the Indo-Bangladesh border, the DGP said.
Replying to a question, the DGP said the police never make arrests without evidence.
Formed in 1998 in Bangladesh by Maulana Abdur Rahman, the JMB was banned by the Bangladesh government in 2005.