SRINAGAR, India/MUZAFFARABAD, Pakistan (Reuters) - At least 10 civilians and five security personnel were killed in cross-border shelling between India and Pakistan on Friday, in one of this year’s deadliest days along the heavily militarised frontier separating the nuclear-armed rivals, officials said. Indian officials said the barrage of mortars and other weapons along several parts of the Line of Control - the de-facto border - began after Indian troops foiled an infiltration attempt from Pakistan in northern Kashmir. Pakistan’s military said in a statement it had responded to unprovoked and indiscriminate firing by the Indian army. Indian officials said six civilians, three soldiers and a border guard were killed on their side. The Pakistan military said four civilians and one soldier were killed on the Pakistani side.