CCTV footage from an RAF base captured the moment 19-year-old motorcyclist Harry Dunn was killed in a “big fireball” following a road crash.

The suspect, 42-year-old Anne Sacoolas, who is reported to be married to a US intelligence official, was granted diplomatic immunity after the collision, though that protection is now in dispute.

Mr Dunn’s mother, Charlotte Charles, and the teenager’s father, Tim Dunn, told a press conference in New York that they felt let down by the decision to allow Ms Sacoolas – the motorist who allegedly collided with the teenager – to flee the country and return to America shortly after the crash outside RAF Croughton in Northamptonshire on August 27.

The teenager’s parents called on Ms Sacoolas to return to the UK to face justice, saying: “It’s the right thing to do.”

The family said CCTV evidence of the moments leading up to the crash made it “a clear-cut case”.

When asked if the footage had been sourced from the RAF base, a Northamptonshire Police spokeswoman said: “Yes, I believe so.”

Speaking at the press conference on Monday, a tearful Mrs Charles told reporters: “We just want to know that she is being brought back to the UK.

“You know, that would be a huge step in the right direction. It’s the only right thing to do. It’s the only humane thing to do.”

She added: “All of our grief has gone on hold, it’s coming out in other horrific ways, your legs feel like lead, you’re in pain morning until night that no painkillers can take away.

“You’re not able to cry, because we can’t understand this whole situation as to why she (Anne Sacoolas) would have left us without wanting to meet us back then.

“She needs to get on the plane and get back to the UK, just do the right thing.

Harry Dunn death
A Foreign and Commonwealth Office letter to the Dunn family, explaining that the US suspect in the case of Harry’s death does not have diplomatic immunity (Family handout/PA)

“It shouldn’t be that difficult, it shouldn’t have been this difficult, she surely didn’t have to go.”

Mrs Charles said the family has been told there is CCTV evidence showing Ms Sacoolas leaving the RAF base “on the wrong side of the road”.

She added: “CCTV follows her all the way down the road on the wrong side of the road and you see Harry’s headlight of his motorbike and then there is a big fireball when his bike went up.

“So it should have been a clear-cut case. It should have been simple and I promised Harry and we promised Harry as a family when we’d lost him that night, when we were talking to him in the hospital when we’d lost him already, that we would make sure justice was done.”

The teenager’s father also called on US President Donald Trump to act in an effort to secure justice for his son.

Mr Dunn said: “There’s just no way I can start grieving yet, as a family we can’t start, we need this resolved.

“Somewhere, somebody has made a decision to give this lady immunity.

“On that night there was an accident, a lady made a mistake, she killed our son, she didn’t mean to kill him, she didn’t mean to have an accident, but you cannot walk away from that and just leave and expect nothing to happen.

Harry Dunn death
Bruce Charles, left to right, Charlotte Charles, lawyer Radd Seiger, Tim Dunn and Tracey Dunn at a press conference in New York (Josh Payne/PA)

“Our boy died and he deserves to have some justice. That’s all we want.

“I would say to him (President Trump) as a man, as a father, how could you let this happen? If you are a father and your child died, surely you’d want that person to own up and take responsibility for their action?”

Speaking to the PA news agency following the press conference, Mr Dunn called on the suspect to “come out of hiding” and “set an example” to her own children.

He added: “Just get on the plane. Face up to what you have done, having left us seven weeks ago with what we have lost – this is a hundred times, a hundred times harder than it needed to have been.

“Time is up now. Time is of the essence. Get on the plane. Just face it. Deal with it.

“Then she can move on with her life, her children can hopefully find a way of getting as much therapy as they need because, bless them, two of them were in that car.

“End the suffering. Go back to the UK and face it.”

Harry Dunn death
Charlotte Charles with her son Harry Dunn (Family handout/PA)

Mr Dunn also said “something is not right” after the family were sent a letter from the Foreign and Commonwealth Office explaining that Ms Sacoolas does not have diplomatic immunity.

He said: “It just doesn’t seem to sit right with me.

“It just seems like such a long-winded way around things and I think they just need to stop messing about.”

The family reiterated their hope to secure Ms Sacoolas a suspended sentence, rather than immediate custody, so as not to take her away from her family.

But they said their hopes of a meeting between the two parties should happen “in her own words, in a room, on our terms” back in the UK.