<br/>In Jammu and Kashmir, in yet another ceasefire violation, Pakistani troops opened fire at Kanachak sub-sector in Jammu district early Tuesday morning. The BSF retaliated leading to a heavy exchange of fire between the two sides. <br/><br/>A senior BSF officer said in Jammu that cross border firing started around 2 a.m. even as a group of militants tried to enter the Ulfa Machail border outpost along the Border and were challenged by a BSF patrolling party. The firing continued till 5.00 a.m.<br/><br/>