Buckby, 23, who is a former BNP member and stood for election for Liberty GB in the 2014 European elections, said: “We can not let Jo Cox’s tragic death be in vain”.
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Cox was stabbed and shot outside her constituency in Birstall, West Yorkshire on Thursday.
“Jo was a humanitarian to her core – a passionate and brilliant campaigner whose grit and determination to fight for justice saw her time and time again driving issues up the agenda and making people listen and above all act”, he said.
Speaking in the House of Commons, Prime Minister David Cameron said: “Quite simply, there are people on our planet today who are only here and alive because of Jo”.
He has since been remanded in custody after appearing at the Old Bailey.
Mair, who was handcuffed and wearing a grey tracksuit, then remained silent when asked to provide his date of birth and address, the reports said.
Thomas Mair is charged with murder, grievous bodily harm, possession of a firearm with intent to commit an indictable offence and possession of an offensive weapon. A 52-year-old man appeared in court charged with her murder on Saturday.
Parliament was in recess for campaigning in the European Union referendum when Cox was shot and stabbed to death outside a library in her northern England constituency on Thursday.
Police have said counter-terrorism officers are also involved in the investigation into the attack, which occurred as Cox arrived for a meeting with constituents. She said her sister would live on through her husband Brendan and “through her truly wonderful children, who will always know what an utterly unbelievable woman their mother was”.
Parliament will be recalled on Monday to allow MPs to pay further tributes.
Gun murders are relatively rare in Britain and Cox’s killing has shocked the country.
Mourners turned out in support as Mrs Cox’s sister Kim Leadbeater read an emotional tribute to her sister on Saturday afternoon.
A 77-year-old man, who came to her aid, was also injured and remains in a stable condition in hospital.
A memorial fund set up in Ms Cox’s name had raised more than £700,000 for three causes close to her heart – the Royal Voluntary Service, anti far-right campaign Hope not hate and Syria rescue group the White Helmets.
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“Her face was full of blood”, said Ben Abdallah, who campaigned alongside the Labour politician before she was elected to parliament for the first time past year.
