Rwanda's intelligence chief Karenzi Karake, who is wanted in Spain for war crimes, has been arrested in London, the BBC reported.

Gen Karake, 54, was arrested at Heathrow Airport on Saturday, and remanded in custody ahead of a court hearing on Thursday.

A British Foreign Office spokesman said they were informed by London’s Metropolitan Police on June 20 “that they had arrested general Emmanuel Karenzi Karake," according to The Guardian.

He is accused of ordering massacres while head of military intelligence in the wake of the 1994 Rwanda genocide.

Gen Karake is also accused of ordering the killing of three Spanish nationals working for Medicos del Mundo.

In 2008, a Spanish judge indicted him for alleged war crimes along with 39 other current or former high-ranking Rwandan military officials.