UK National Crime Agency — International Corruption Unit

The UK National Crime Agency's International Corruption Unit concluded its decade-long investigation into former Nigerian Petroleum Resources Minister Diezani Alison-Madueke in 2026, bringing the high-profile corruption case to trial in London. The specialized unit, established to tackle cross-border financial crimes, had been pursuing charges related to money laundering and bribery allegedly involving Nigeria's oil sector during Alison-Madueke's tenure from 2010 to 2015. The case represented one of the most significant international corruption prosecutions involving a former Nigerian official.

The investigation began in the mid-2010s as part of broader international efforts to combat kleptocracy and recover stolen assets from developing nations. Alison-Madueke, who served under President Goodluck Jonathan, had been accused of diverting billions of dollars from Nigeria's oil revenues through complex international financial networks. The case highlighted the challenges of prosecuting transnational corruption, requiring cooperation between Nigerian and British authorities, and involved tracing assets across multiple jurisdictions including the UK, United States, and several other countries.