A crude bomb went off outside the NIA camp office.
An explosion was reported near the National Investigation Agency's office in Kolkata today, where the anti-terror probe agency has established its camp office to probe the Burdwan blast.
Forensic experts and the bomb squad rushed to the site.
A crude bomb went off outside the NIA camp office, causing damage to the boundary wall of the campus of the Central Reserve Police Force or CRPF, official sources said.
The West Bengal police and NIA together have arrested two top commanders of Jamaat-ul-Mujahideen Bangladeh, including Sajid on Saturday and Amjad Sheikh today.