being present was a 'catalyst' to his death. The Independent Office for Police Conduct (IOPC) cleared Kent Police of wrongdoing but did suggest the force should review the policy of allowing camera crews to accompany officers, footage relating to Cordes will not feature in the show. The force has appeared a number times in the BBC documentary Critical Incident. The show has featured an incident during which a Kent Police officer was knocked over and injured by a dangerous driver, an officer being attacked with a knife in an address in Ashford, firearms officers pursuing a vehicle, and officers using their belts to rescue a man dangling in Northfleet Quarry. Officers from the Serious Crime Directorate discussed the 2013 murder of Anne-Marie Birch in the BBC documentary Love You to Death: A Year of Domestic Violence, and the Sarah Wellgreen case the Sky documentary Killer in my Village. Kent Police detectives and officers were featured arresting numerous fraud suspects in an episode of the ITV show Tonight entitled "Fraud: The Public Threat". Noteworthy incidents Operation Stack, and more recently Operation Brock have been implemented numerous times over the years by Kent Police under the Civil Contingencies Act 2004. Both manage HGV traffic in the event of disruption at the Port of Dover or the Channel Tunnel but remain highly controversial tactics. On 4 July 1996, Lin Russell, her daughters Megan and Josie, and their dog were attacked with a hammer in Chillenden. Only Josie survived and, in 2001, Michael Stone was convicted of the two murders. Numerous appeals against his conviction have since failed despite claims that serial killer Levi Bellfield may instead have been responsible. On 28 Aug 2001, serving Kent Police officer Karl Bluestone murdered his wife and two of his four children before committing suicide at his home in Gravesend. In Feb of 2006, Kent Police investigated the 'Securitas' robbery, during which a gang of six stole approximately £53 million from a Securitas depot in Tonbridge. The gang received over 100 years in prison between them and £21 million has never been recovered, the incident remains the largest cash robbery in the UK to date. On 11 June 2007, Kent Police shot and lawfully killed Anne Sanderson after she pointed what was later identified as an air pistol towards armed officers in Sevenoaks. In November 2007, Kent Police and Essex Police began a search of serial killer