Three soldiers and a civilian were killed on Thursday when security forces were attacked by militants in Jammu and Kashmir's Shopian district, police said.The forcers were returning from a search operation in Kungnoo village when they were attacked."The victims included a lieutenant colonel and the civilian, a woman, was inside her house when a bullet hit her during the firing," the police said.Seven soldiers were also injured in the attack."Reinforcements were immediately rushed to surround the area and track the militants," the police added.