Taking over the case from Howrah GRP, the CID thoroughly examined the items found in the unclaimed baggage today and concluded that these were low-intensity landmines.
They immediately took the items to an isolated place and defused two, while the rest were also being defused one by one, the CID official said.
The close circuit TVs of the station's platform, where the train arrived last night was also being monitored to see if the carrier of the bags could be identified.
A senior GRP official earlier said the packet was discovered by the railway staff during a routine check before cleaning the coach once the train arrived at platform 17.
The movement of local and long distance trains from different platforms in the busy railway junction remained unaffected.