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The UK Government were warned that a US spy’s wife was to leave the country after she was involved in a fatal car crash.

Foreign Secretary Dominic Raab revealed the US embassy had told Foreign Office officials Anne Sacoolas would be leaving the country “imminently” unless they had strong objections.

Harry Dunn, 19, died after a car driven by Mrs Sacoolas crashed into his motorbike near RAF Croughton, an air force base in Northamptonshire in central England used by the U.S. military.

Mr Raab told MPs diplomatic immunity rules for US personnel at the RAF Croughton annex would be reviewed.

(Image: SKY NEWS)

He said: “If her immunity had been waived, Northamptonshire Police would have then been able to compel her to cooperate fully with their investigation.

“However on the 13th of September, the FCO were informed by the US Embassy that they would not waive immunity, and that the individual would be leaving the country imminently unless the UK had strong objections.

“We duly and immediately objected in clear and strong terms and we have done ever since.”

But he said the police would have had no legal power to intercept and arrest her, because her immunity had not been waived.

He said the Foreign Office followed up on September 16, only to be told she had left the day before.

He added: “We will continue to fight for justice for them.

"I've already commissioned a review of the immunity arrangements for US personnel and their families at the Croughton annex holding privileges and immunities under the Vienna Convention on Diplomatic Relations.

"As this case has demonstrated, I do not believe the current arrangements are right and the review will look at how we can make sure that the arrangements at Croughton cannot be used in this way again."

(Image: REUTERS)

It comes after the family of Harry Dunn cancelled a meeting with the chief constable of Northamptonshire Police after it became clear his intention was not to answer "a series of key questions".

The teenager's parents, Charlotte Charles and Tim Dunn, had scripted a series of questions for Chief Constable Nick Adderley ahead of a scheduled meeting on Wednesday afternoon.

But the PA News Agency were told the force's chief contacted the family to "provide clarity" that the meeting would only be a "private and personal visit to express condolences".

Radd Seiger, who has acted as a spokesman for the family since the crash, responded to Mr Adderley, claiming the time for condolences had "long since past" and the time for "answers and truth is long overdue".