Salah Uddin Kamran, 30, was arrested from Tongi Station Road on Wednesday at around 8 p.m.
Kamran told police during primary interrogation that he was close to Abu Hakim, a militant who had been killed in the Kalyanpur raid on July 25, Dhaka Tribune quoted Dhaka Police Deputy Commissioner Masudur Rahman as saying.
Kamran was also close to killed militant Tamim Chowdhury and other top ranks of New-JMB, he said.
"He said he came to Dhaka in May, after joining the militant group, and was trained in Paikpara area by now-detained militant suspect Rakibul Hasan Regan," Rahman added.
According to police, Kamran told them that he had been working to spread the ideology of New-JMB and give momentum to its activities. He also confessed to planning and carrying out subversive activities in the country.
Tamim Chaudhury, who was behind the Dhaka cafe attacks, was killed along with two other militants in a raid on an IS safehouse in Narayanganj Sadar Upazila in Dhaka by police forces on August 27.
On Thursday, a Dhaka court placed Kamran on a six-day remand in connection with Kalyanpur terror attack case, The Daily Star reported.
The July 2 attacks on Holy Artisan Bakery in Gulshan claimed 29 lives, including that of 19-year-old Indian Tarishi Jain.
