The explosive might have planted some insurgent group like Kamtapur Liberation Organisation (KLO) active in this part bordering with Assam.
DSP,CID, BImal Kumar Mondal said the deceased is identified as Lal Bahadur Lohar, whose hands and head split in the impact of the bomb.
The critically injured jawans have been admitted to Alipurduar Sadar Hospital.
The incident happened when a patrol police noticed an abandoned cycle at Chowpatti in Alipurduar in Jalpaiguri district in the wee hours
A tiffin carrier was also attached to the cycle.
Suspecting some explosives might be contained inside the steel box the bomb disposal squad at Siliguri was informed immediately.
The jawans after put the steel box in a plastic sack and took it to a nearby football field where the bomb went off during disposal, killing the jawan and injuring the two.
Police said the bomb might have been left by some insurgent groups like KLO.
On March 18, 2009, bombs attached to a abandoned cycle had killed three persons and injured five in the same region.
--IBNS (Posted on 29-08-2013)