According to government sources cited by the "Daily Telegraph", it would only be triggered following a COBR meeting. The plan was put in place following the January 2015 Île-de-France attacks in France. It was intended to be kept secret, but was accidentally disclosed in July 2015 after being inadvertently uploaded to the website of the National Police Chiefs' Council. It was said to have been contentious with the Army leadership, due to concerns about it causing overstretch, training given to troops, morale problems and difficulties with deciding when to end the operation.