The world of Nigeria's sex-trafficking 'Air Lords'

Last year, the BBC's Sam Piranty was given access by the Catalan police, Mossos D'Esquadra, to an investigation into a Nigerian sex-trafficking gang. He spoke to traffickers and women rescued from sexual slavery before filming an early morning raid in November, which led to 23 arrests. He also discovered that the gang is now using London as a gateway into Europe.
The raid results in the arrest of the leaders of a Nigerian-based group running an international sex-trafficking ring in Barcelona. It's known as the Supreme Eiye Confraternity (SEC), or the Air Lords, and 23 people are now behind bars, with European Arrest Warrants issued for those who have left the country.
BBC