held this position in January 2015. 2010 resurgence Nearly six months after the killing of Yusuf, the group carried out its first terrorist attack in Borno in January, killing four people. During the following few years, the violence escalated in terms of both frequency and intensity. On 7 September, a prison break in Bauchi freed more than 700 Boko Haram militants, replenishing their force. On 24 December, Boko Haram used four bombs to kill 32 people in Jos, Plateau State. On the same day, they killed six people in attacks against churches in Maiduguri. 2011 On 29 May, a few hours after Goodluck Jonathan was sworn in as president, several bombings purportedly by Boko Haram killed 15 and injured 55. On 16 June, Boko Haram claimed responsibility for the Abuja police headquarters bombing, the first known suicide attack in Nigeria. Two months later the United Nations building in Abuja was bombed, signifying the first time that Boko Haram attacked an international organisation. On 4 November, it carried out attacks in Damaturu in Yobe and in Maiduguri, killing over a hundred people, and on 22 and 23 December clashing with security forces, resulting in at least 68 deaths. On 25 December, Boko Haram attacked several churches with bombings and shootings. 15 June marked the start of a Federal Government-sanctioned military effort to counter the growing threat of Boko Haram's insurgency. With 21 Armoured Brigade (21 Bde) of the Nigerian Army as its nucleus, Joint Task Force Operation Restore Order (JTF ORO 1) marked the start of the Army's lengthy counter-insurgency (COIN) campaign against Boko Haram. The campaign has gone through several phases and has greatly escalated in scale, capacity, components and stakeholders, since that time. Results, however, have sometimes been mixed and the Army has been criticised for being too kinetic in its COIN. 2012 In January in Nigeria, Boko Haram attacked Mubi, Yola and Gombi – all in Adamawa State – in addition to Maiduguri and Kano. During the same month, Abubakar Shekau, a former deputy to Yusuf, appeared in a video posted on YouTube. According to Reuters, Shekau took control of the group after Yusuf's death in 2009. Authorities had previously believed that Shekau died during the 2009 uprising. By early 2012, the group was responsible for over 900 deaths. On 8 March, a small Special Boat Service team and the Nigerian Army attempted to rescue two hostages, Briton