Border Security Force (BSF) troopers foiled an intrusion attempt from the Pakistani side in Punjab's Ferozepur sector and killed one intruder, officials said on Monday.The intrusion attempt was made on Sunday evening and one intruder was killed in the counter offensive by troopers in the Border Out Post (BOP) Kassoke in Hussainiwala sector, 280 km from here.The body of the unidentified intruder, believed to be a Pakistani, was recovered from beyond the border fence and handed over to the Punjab Police. BSF officials said that five intruders were detected moving suspiciously close to the border fence. When they were challenged, they fired at the BSF troopers. In the counter offensive, one intruder was killed while the others escaped.The BSF is on high alert along Punjab's 553-km long international border with Pakistan since last year. Terrorists had intruded in Gurdaspur district in July last year and carried out an attack in Dinanagar town close to the India-Pakistan border.