A group of motorcyclists gathered outside the US embassy in London to hold a “rev-off” and say prayers on the third anniversary of the death of fellow motorcyclist Harry Dunn.
The 19-year-old was killed in a collision with a car outside the US military base RAF Croughton in Northamptonshire.
The alleged hit-and-run driver, US citizen Anne Sacoolas, was charged with causing death by dangerous driving four months later.
The suspect had diplomatic immunity asserted on her behalf by the US government after the collision, and was able to leave the UK 19 days after the incident, sparking a diplomatic dispute.
At Saturday’s event in London, organiser Steven Baird turned towards the US embassy and told the community of bikers who had gathered in front of it: “People who come to our country should obey our laws. They cannot and should not get out of our country while disobeying our laws.”
Earlier in the day, the foreign secretary, Liz Truss, released a statement offering condolences to Dunn’s family.
She said: “My deepest sympathies are with Harry’s family on the anniversary of his tragic death.
“I would like to pay tribute to their incredible resolve. We will continue to support them in their search for justice.”
A friend of Harry Dunn’s, Chelsea Wilson, 24, said she was glad to be among those marking the teenager’s anniversary to help ensure Harry is “not forgotten”.
“It is important to just remember him,” she said. “We need to keep the momentum up. We are not going to go away. We are very much still here and supporting the cause.”
Sacoolas was due to appear at Westminster magistrates court in London in January.
However, days before her appearance, the Crown Prosecution Service said the hearing had been vacated to enable ongoing discussions between the CPS and Sacoolas’s legal representatives to continue.
Dunn’s family are marking the third anniversary of his death in private.
Family spokesperson Radd Seiger said: “It is a terribly sad day but no sadder than any other day that his family have to endure.
“We all miss him terribly. He was a giant of a man with an even bigger and warmer personality who cared so much about others.”
