Mark Duggan was shot by police in north London in 2011
The mother of Mark Duggan has lost a High Court bid to overturn a finding that her son was "lawfully killed".
Mr Duggan's death sparked nationwide riots after he was shot by a police marksman.
In January an inquest jury found Mr Duggan, 29, was lawfully killed in August 2011 in Tottenham, north London, despite being unarmed.
Three judges dismissed Pamela Duggan's application for judicial review into the inquest finding.
Ms Duggan had accused the coroner Judge Keith Cutler of misdirecting the jury during the inquest.
'We're not complacent'
Sir Brian Leveson, president of the Queen's Bench Division, who heard the case with Mr Justice Burnett and Judge Peter Thornton QC, said the court "recognised the tragedy" of the loss of Mr Duggan's life - but ruled that none of the grounds of challenge had been established.
Ms Duggan's solicitor Marcia Willis Stewart said Ms Duggan, who was not at London's High Court for the ruling, had asked her to say that she was lodging an appeal.
The solicitor said: "She remains deeply distressed about the death of her son and the circumstances in which it occurred and has instructed the legal team to lodge an appeal".
The Metropolitan Police released a statement following the announcement, saying that tackling those believed to be armed "always carries a risk".
"We are not complacent; our primary aim is keeping Londoners safe, and we recognise the considerable and devastating impact of gun crime on those affected by it," it said.
"We will continue to learn and develop our methods for firearms operations to keep Londoners safe."