US diplomat row: Harry Dunn family told to sue police over 'how predictable' tweet
Northamptonshire Police have passed the details of the interview to the Crown Prosecution Service (CPS) for consideration.
Anne Sacoolas is believed to have been driving on the wrong side of the road when she hit 19-year-old Mr Dunn's motorbike outside RAF Croughton on 27 August.
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Hide AdSuperintendent Sarah Johnson said: "We can confirm that we have completed an interview of the suspect in connection with the death of Harry Dunn, the details of which will be provided to the CPS for consideration alongside the rest of the evidential file already submitted."
Chief Constable Nick Adderley had faced calls from the family for his resignation after he commented on potential legal action by them against Mrs Sacoolas by saying: "How sad but how predictable."
Mr Adderley has since deleted the tweet.
Northamptonshire Fire, Police and Crime Commissioner (PCC) Stephen Mold has said he has spoken to Mr Adderley about keeping force communication "professional and sensitive at all times".
The police chief has since said he "meant no offence" and apologised if his tweet had been "misconstrued or misinterpreted".
Radd Seiger, the spokesman for Mr Dunn's family, said: "They are now going to be subject to legal action.
"The courts will review their decision making processes as well as that of the Foreign and Commonwealth Office.
"The letter has been drafted and the lawyers have said it is good to go.
"The courts should be reviewing their various decisions with how they proceeded with the investigation and how they have supported the family".
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Hide AdIn a statement about Mr Adderley's tweet, Mr Seiger, said: "We call on [Chief Constable Nick Adderley] to resign immediately following his disgraceful now deleted tweet on Tuesday.
"Mr Adderley has displayed a staggering degree of unprofessionalism with this tweet such that he no longer commands the confidence of the family.
"This is simply the straw that broke the camel's back, coming as it does on the back of apparent misconduct and/or incompetence in the handling of this investigation and their egregious breaches of the victims code in not supporting the family or keeping them informed.
"It is with a heavy heart that Harry Dunn's family feel that Mr Adderley should now do the honourable thing and resign."