Murder accused Thomas Mair stabbed and shot British MP Jo Cox then calmly walked away "with not a care in the world", a court has heard.
The 53-year-old is on trial at the Old Bailey in London accused of repeatedly shooting and stabbing the 41-year-old a week before the EU referendum vote.
The mother of two was targeted outside her constituency surgery in Birstall, near Leeds, in front of her staff and residents on June 16th.
David Honeybell had been in the local library, just yards from the attack. He told the court he heard a popping noise and screaming and went outside to see what the commotion was.
He said he saw a man standing over a woman, repeatedly stabbing her. Mr Honeybell ran back into the library to tell people to call the police.
He described how he went back outside after the suspect had fired two more shots. He told the jury: "The attacker just walked away with not a care in the world."
A 999 call made moments after the MP was attacked was played to the jury in which the operator was told: "There's hell on. It's chaos."
Darren Playford urged emergency services to hurry, saying: "He's shooting everyone."
The operator said: "Who's shooting everyone?".
He replied: "The gunman. Outside the library in Birstall."
He told how the man had "stabbed a lady", adding: "He's following me at the moment."
Local taxi driver Rashid Hussain pulled up at around the same time as Mrs Cox's arrival at Birstall Library in a silver Vauxhall Astra.
As he was giving his fare her change, he heard what sounded like a "firecracker", jurors were told.
Mr Hussain demonstrated in the witness box how the man had stabbed Mrs Cox five or six times in front of him.
He said: "When I reached near, he stepped back. I said: 'What are you doing? What's wrong with you?'
"He said: 'Move back, otherwise I'm going to stab you.' He was standing there with two ladies and another man. He said, 'Better move back.'
"He shot twice. He moved back and shot again."
Mr Hussain told jurors that by this point Mrs Cox, who he had recognised as his MP, was bleeding and was being helped by an Asian woman.
He said: "Jo's head was in her lap and she was pleading for Jo to stand up, talking about her kids.
"Her hands and clothes were covered in blood. She was the only person there helping her."
Clarke Rothwell was in a nearby sandwich shop when he heard a "popping" noise and a woman scream.
Mrs Cox then slumped to the floor before she was shot in the stomach, he said.
The man shouted words like "this is for Britain" and "put Britain first" before reloading his gun and shooting for a third time, the witness told jurors.
Mair denies Mrs Cox's murder, possession of a firearm with intent to commit an indictable offence and possession of an offensive weapon - a dagger.
He also pleads not guilty to causing grievous bodily harm with intent to Mr Carter-Kenny on the same date.
The trial is expected to run for another two weeks.
