At least 300 detonators were seized from New Jalpaiguri railway station on Thursday.
The detonators in three packets were found lying on the narrow gauge platform at 0830 IST, Assistant Commissioner, Railway Police Force, K K Dasgupta said.
The narrow gauge
Senior police officials, including Deputy Superintendent of Police Asit Pal, have rushed to the spot.
No arrests have been made yet, but the police have cordoned off the area, sources said.