According to a BSF official, alert jawans observed some movement along the border in Abdulian area of the RS Pura sector at around 2 AM, following which they opened fire.
The firing forced two persons from the Pakistani side, who were allegedly trying to sneak across, to retreat.
The BSF official said the crossover attempt may have been for smuggling purposes.
"They also threw a packet across the Indian fence...The packet contained a mobile phone and two SIM cards with Pakistan numbers," he said, adding that a similar packet was also found on the other side of the fence.