Pakistan Rangers Sunday targeted BSF positions on the international border in Jammu district."Pakistan Rangers targeted Jogwana post of the BSF in R.S. Pura sector of Jammu district today (Sunday) morning," a senior police officer told IANS here."Pakistan Rangers used small weapons and automatics to target the post. BSF retaliated effectively using similar calibre weapons.""Firing exchange continued from 1 a.m. to 1.15 a.m," he added.The ceasefire violation occurred on a day the Indian security forces are on maximum alert because the US President Barack Obama arrived on a three-day visit to India today (Sunday).