Four Pakistan Army soldier were killed and several injured as Indian Army retaliated to unprovoked ceasefire violation along the Line of Control (LoC) in Rajouri district of Jammu and Kashmir today. Pakistan Army started heavy mortar shelling and firing at two Indian positions in Jhanger and Sher Makedi village near the LoC in Naushera, triggering of a gun duel, a defence official said. "Pakistan Army initiated indiscriminate firing of small arms, automatics and mortars on Indian posts on the LoC in two villages of Naushera sector in Rajouri district at around 8 am. Indian Army posts are retaliating strongly and effectively," said Defence Ministry spokesman, Lt Col Manish Mehta. According to the defence sources, mortar shell fired by the Indian Army fell into an Army camp across the border and Pakistan suffered maximum causality. Pakistani helicopters and ambulances were seen from across the border to shift the injured and dead Pakistan Army soldiers to near by hospitals. These areas normally remain calm but Pakistan is now using soft areas for infiltration of armed terrorists from old routes. The Pakistan Army is giving cover fire to terrorists so that they can infiltrate to kick-up violence in the border districts of Rajouri and Poonch, defence officials said. Intelligence agencies have already alerted the Army and the state police that this summer will be hot and more than 100 terrorists are waiting on launching pads near Line of Control to cross over to the Indian side.