Operation Crucible is a police-led, multi-agency investigation into the organised theft and unlawful trade of metal in England and Wales. Involved agencies include British Transport Police, the Metropolitan Police Service, Hertfordshire Constabulary, Norfolk Constabulary, Suffolk Constabulary, Northamptonshire Police, Leicestershire Police, Essex Police, Cambridgeshire Constabulary, the UK Border Agency, Her Majesty's Revenue and Customs, Trading Standards and the Historic Buildings and Monuments Commission for England.
- Operation Icarus - Police investigation into the organised theft and black market trade of religious and church artefacts in England and Wales
- "Heritage experts join police for metal theft crackdown". BBC News. 10 September 2016. Retrieved 10 September 2016.
- "Operation Crucible – Police and heritage experts coordinate action against metal thieves for first time". British Transport Police. 9 September 2016. Retrieved 10 September 2016.
- "British Transport Police: The fight against thieves targeting cultural heritage". YouTube. 9 September 2016. Chief Constable Paul Crowther, the National Police Chiefs' Council Lead for Heritage Crime, outlining Operation Crucible. Retrieved 10 September 2016.