Initial authorization for the mission was given by the UN Security Council in resolution 1769 of 31 July 2007.[8] This resolution set the strength of the mission as "... up to 19,555 military personnel, including 360 military observers and liaison officers, and an appropriate civilian component including up to 3,772 police personnel and 19 formed police units comprising up to 140 personnel each". The mission's authorisation was extended in essentially unchanged form for each of the following five years: UN Security Council resolution 1828 adopted on 31 July 2008, resolution 1881 on 30 July 2009, resolution 1935 on 30 July 2010, resolution 2003 on 29 July 2011, and resolution 2063 adopted on 31 July 2012.