A taxi driver has described seeing MP Jo Cox being stabbed five or six times by a man who warned onlookers to "better move back".
Rashid Hussain told the jury at the Old Bailey he had dropped off a fare when he was alerted to loud noise like "fireworks going on".
He then described seeing a man "stabbing somebody" behind a car.
"He was standing up and she was on the road...she was bleeding, Mr Hussain said.
"I said: 'what are you doing, what's wrong with you.' He said: 'Move back, otherwise I'm going to stab you.'"
Mr Hussain added: "He said something and the last words were 'Britain first.'"
Thomas Mair, 53, is accused of murdering the 41-year-old outside her constituency surgery in Birstall, near Leeds, on June 16.
Mair is also charged with causing grievous bodily harm with intent to Bernard Carter-Kenny.
He has denied all the charges against him.
She may have only served her constituents for little more than a year, but those whose lives Jo Cox touched won't forget her lasting legacy.
Thomas Mair is being described as an extremist, a fanatic, an assassin – even ‘a constituent’. But make no mistake – he is a terrorist.
Thomas Mair "betrayed the quintessence of our country" in the senseless killing of MP Jo Cox, the judge said.