Joint Operations Cell is a unit of GCHQ, a British signals intelligence agency, and the National Crime Agency (NCA), a United Kingdom national law enforcement agency. It opened in November 2015 with the intention of tackling a range of crime on the Dark Web, initially focusing on child sexual exploitation, but also including international sex trafficking and the sale of drugs and weapons on darknet markets. Its intelligence methods include analysis of data gathered through mass surveillance. Joint Operations Cell is a collaborative effort of GCHQ and NCA, co-located in Warrington.