Media authorities identified Abdullah Umar as a law student of the International Islamic University and a son of army colonel. In an offensive in Bajaur by Frontier Corps, a militants' stronghold village Damadola was captured and cleared by 6 February 2010. Bajaur was declared conflict free zone by 20 April. On 23 March 2010, the Pakistan armed forces launched an offensive to clear Orakzai. Officials also announced a future offensive in North Waziristan. The week prior the Pakistan military killed approximately 150 militants in fighting in the region. It was expected that all tribal areas would be cleared by June 2010. On 3 June, Pakistani authorities announced a victory over the insurgents in Orakzai and Kurram. As late as 2010, chief of naval staff Admiral Noman Bashir had coordinated many of successful tactical ground operations against TTP hideouts, to support the army and air force pressure on militants. Many successful operations were executed by the navy, and its operational capability gained international prominence. By 2011, Pakistan's armed forces were stretched thin by natural disasters and deployments against extremist groups, with one third of the army deployed for the fight, another third along the Indian border and the rest engaged in preparing to deploy. On 1 May 2011, in a clandestine operation in Abbottabad, al-Qaeda leader Osama Bin Laden was located and killed by the U.S. Navy SEALs in his private compound. The groups affiliated with the armed TTP vowed, via media, to avenge Osama's death upon the Pakistan Armed Forces. On 21 and 28 April, senior al-Qaeda operative Ilyas Kashmiri conducted a series of coordinated terrorist attacks on the Pakistan Navy presence in Northern and Southern contingents. This included attacks on high naval officials of the Pakistan Navy in Karachi, first attacking their bus near the Navy bases. Finally on 22 May, TTP attacked the Mehran Naval Base, killing up to 10 naval officers, wounding 30 others, and destroying two naval reconnaissance aircraft, during the attack. In response, the navy's SSG(N) launched its largest offensive efforts since the 1971 operations, and managed to control and secure the base after a massive shootout. Operationally resulting in tactical success, the navy's counter offensive killed all the militants and ring leaders behind these operations. Kashmiri was widely suspected in the Mehran operation. On 4 June 2011, Ilyas Kashmiri was killed by a U.S. drone strike in South Waziristan. In 2012, the north-west region of Pakistan experienced periodic bombings perpetrated by insurgents, resulting in thousands of deaths.