The BSF shot dead four persons, including two Pakistani intruders, and recovered 10 kg of heroin from their possession on the Indo-Pak border in Punjab's Ferozepur district in the wee hours on Sunday. Besides the Pakistani intruders, two Indian nationals were also gunned down by the BSF, deputy inspector general of BSF RK Thapa said. The BSF personnel belonging to 191 battalion spotted some movement near the Mehndipur border outpost in Ferozepur sector at about 4:40am and opened fire, Thapa said. He said 10 kg of heroin, two pistols and a motorcycle were recovered from the spot. One of the intruders is believed to have fled back to the Pakistan side, the DIG said. The two Indian nationals are yet to be identified, he said, adding that investigation is underway.