Amritsar, Sep 12 - Border Security Force (BSF) troopers fired from machine-guns into Pakistan after rockets were fired into Indian territory in the Amritsar sector from across the border Friday night.

BSF officials Saturday morning launched an operation to find if any more rockets were fired into the Indian side near the Attari joint check post from across the barbed-wire fencing border between both countries.

'We did retaliatory fire from machine-guns and have lodged a strong protest with the Pakistani side,' Punjab frontier deputy inspector general of police Jagir Singh told IANS.

Residents of border villages near the Attari-Wagah checkpost in Amritsar district informed BSF officials about rockets landing in fields, BSF inspector general of police for Punjab frontier Himmat Singh said.