New Delhi/ Chennai, Oct 03 (ANI): Opposition on Thursday demanded a strong response from the central government after a top army general said that 30 to 40 heavily armed fighters have infiltrated into Kashmir from Pakistan. Lieutenant General Gurmeet Singh told a news conference in Srinagar that the fighters crossed the Line of Control and is holed up for the past nine days in thick forests in the area. The latest fighting was taking place as Prime Minister Manmohan Singh and his Pakistani counterpart Nawaz Sharif pledged in New York last weekend to work towards strengthening a 10-year-old ceasefire that has frayed in recent months.