Rwanda’s intelligence chief Karenzi Karake, who is wanted in Spain for war crimes, has been arrested in London.
The Met Police’s extradition unit arrested Gen Karake at Heathrow Airport on Saturday, it is understood.
The 54-year-old was remanded in custody until Thursday after appearing before Westminster Magistrates’ Court.
He is accused of ordering massacres while head of military intelligence in the wake of the 1994 Rwanda genocide.
He is also accused of ordering the killing of three Spanish nationals working for Medicos del Mundo.
The Rwandan government is said to be puzzled by the timing of Gen Karake’s arrest, as he had travelled to the UK several times since the indictment was issued.
Williams Nkurunziza, Rwanda’s High Commissioner to the UK, called the arrest “an insult”.
“We take strong exception to the suggestion that he’s being arrested on war crimes,” he told the BBC World Service.
“Any suggestion that any of our 40 leaders are guilty of crimes against humanity is an insult to our collective conscience.”
Phillip Gourevitch, a leading writer on Rwanda, told Newsnight that Gen Karake’s arrest was the equivalent of the head of the UK’s MI6 or the US’s CIA being arrested.
He said the Spanish indictment had been criticised as highly politicised by many, including US diplomats.
In a statement the British High Commission in Rwanda said the arrest was a “legal obligation” carried out on behalf of the Spanish authorities but stressed the UK had a “close relationship” with the Rwandan government.
“We co-operate closely on a growing range of regional and international issues,” the statement said.
“Her Majesty’s Government greatly values the close relationship with Rwanda and is committed to that relationship for the long term.”