In a first major strike by Militants after the Mehbooba Mufti-led PDP-BJP coalition government took office in Jammu and Kashmir,a group of unidentified Militants attacked a police party in the Srinagar city, killing three policemen on Monday.Hizb-ul-Mujahideen (HM) has claimed responsibility for attacks in which 3 cops were killed today. A spokesman of group told a Srinagar based news agency that its members have carried out attacks in the city.A high alert has also been sounded across the Line of Control and the Army has stepped up vigil in view of intelligence inputs of Pakistan-backed Militants waiting to slip into the Indian side.According to reports, a group of heavily armed Militants first attacked a police party at Zadibal Police Station in Srinagar, killing two policemen.ASI Nazeer Ahmed and Constable Basheer Ahmed were killed in the attack, report said.One policeman also sustained injuries in the attack.Restrictions in Srinagar to prevent separatists rally.Two policemen, including a junior level officer, were killed by Militants in a hit and run attack in summer capital Srinagar, said a police officer.Motorcycle borne militants attacked a ‘Naka’ (checking) party near the mills in Zadibal area of Srinagar city today,” the officer said.When the motorcycle borne militants were signalled to stop, they fired at the police party resulting in the death of an assistant sub-inspector (ASI) and a constable.The militants fled after carrying out the attack. A high alert has been sounded in the city to nab the assassins.