With a Bangladesh intelligence team arriving in the city to question suspected IS operative Mohammad Masiuddin, the NIA on Tuesday secured his two - day custody.
The National Investigation Agency moved a city court to seek the custody of Masiuddin alias Musa, which was granted.
Musa was nabbed by the West Bengal Criminal Investigation Department (CID) on July 4 from aboard a train in Burdwan on a charge of having links with foreign extremists, including the Islamic State (IS).
The probe was subsequently taken over by the National Investigation Agency (NIA).
As Musa's interrogation revealed his links with Jamaat - ul - Mujahideen Bangladesh, a militant outfit blamed for the terror attacks in Dhaka and Kishoreganj, the Bangladeshi authorities also wanted to question him.
The Bangladeshi team, including officers from the Rapid Action Battalion that is probing the twin terror attacks in Bangladesh, arrived here on late Monday.
"A Bangladesh intelligence team is in the city in connection with their probe into the terror attacks.
The NIA and Bangladeshi agencies have been cooperating with each other for countering terrorism and circulation of fake currency.
The visit of the Bangladeshi team is nothing unusual, " said an NIA officer.
The Bangladeshi team last month visited the NIA headquarters in Delhi.
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