The CNC does not guard the United Kingdom's nuclear weapons; this role is the responsibility of the British Armed Forces and the Ministry of Defence Police.The CNC's Annual Report for 2010–2011 (page 15) states that "...the crime dealt with by officers at civil nuclear sites remains low in volume.[13] During the year 2010–2011, the CNC made 12 arrests,[14] although two of those people were de-arrested at the scene (one when it was realised that the person was not wanted on warrant after all and another where it was decided that police action was not appropriate in relation to an alleged assault).[28] For a period of three months during 2015, ten CNC officers were seconded to the British Transport Police's Counter Terrorism Support Unit in London.This detachment helped to cover the shortfall in firearms officer numbers in London in the wake of recent European terror attacks on major cities.Ms May has also changed the law to enable the 1,000 armed police officers guarding Britain's nuclear power stations to be redistributed in the event of multiple terror attacks."[29] A press release from the CNC and Home Office details the changes made to enable a greater mutual aid role (dated 7 March 2016).