"I have come to Kolkata to review the investigation into the case. I visited Burdwan and Murshidabad. I had a detailed discussion with my officers. We have evolved strategies regarding arrests of absconding accused persons. I can't reveal anything because it will affect the investigation," he told reporters here.
Kumar, who arrived here in the morning, visited Khagragarh in Burdwan, where a blast on October 2 had claimed the lives of two suspected terrorists belonging to Jamaat-ul-Mujahideen Bangladesh.
NIA investigators during a search operation jointly with the Burdwan district police found Improvised Explosive Devices from this house of Rezaul Karim.
Three persons, including two women - one of them the widow of a suspected terrorist who died in the blast - were arrested and interrogated by the NIA.
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The NIA chief later left for Beldanga in Murshidabad district and visited the house which one of the suspected dead terrorists Shakil had rented.
The NIA team during its investigation over the last few days seized a large number of books and documents, 12 trunks and a car from a madrasa in Burdwan district where the Khagragarh blast accused were suspected to have been radicalised in Jihadi ideology.
NIA officers a few days back with the help of the NSG team had detonated the improvised hand grenades, which they had found during investigation.