Officials said the incident took place on May 14 at about 10 AM along the Banpur border post in Krishnanagar district of West Bengal when a BSF patrol party laid an ambush and intercepted a group of suspected smugglers about 300 metres from the International Border (IB) on the Indian side.
They said, soon after, close to a dozen people carrying 'dha' (sharp edged knifes) surrounded the BSF men and isolated Constable D Sawant who was just armed with a 'lathi'.
Subsequently, when the suspected smugglers did not pay heed to Atreya's appeal, he fired the second shot which was taken by a Bangladeshi boy identified as Sajjal Halsena, a resident of the Chuadenga district of Bangladesh.
The teenager, they said, later succumbed to his injuries after he was taken by his friends to the other side of the border.
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Patrol parties along with border keep a mix of lethal and non-lethal weapons as per a treaty inked between the two sides few years back to minimise border killings.
Atreya, a commando-trained officer of the border guarding force, has recently become the face of the BSF in a international documentary which brought to the audience the exploits of the over 50-year-old force raised in 1965.
Sources said the BSF headquarters took a stern view of the case as it came at a time when a high-level delegation of the Border Security Force, led by its Director General K K Sharma, is in Dhaka for the annual border talks with their counterparts Border Guard Bangladesh.