'Our investigation is on and we are raiding various places to nab the accused,' said Singh.

This is the third major breakthrough by the BSF in the last few days.

BSF personnel had recovered six kilograms of heroin, worth Rs.30 crore (Rs.300 million) in the international market, Monday, from across the fence in some paddy fields in Amritsar district. In this case also, the smugglers managed to escape, taking advantage of the darkness.

The BSF arrested four Pakistani smugglers Saturday and recovered two kilograms of heroin, a night vision device, arms and ammunition from their possession, while they were trying to cross the Khemkaran sector in the border district of Ferozepur.