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Nigel Farage has called for Zack Polanski to be arrested after the Green Party leader shared a photograph of a man wearing a T-shirt 'planning his decapitation'.
Mr Polanski, 43, shared the image of the unknown bearded man, wearing sunglasses, a rainbow-striped hat and making the 'peace' symbol, to his 713,000 followers on Instagram earlier today.
The man's black top showed a guillotine with the slogan: 'We're only making plans for Nigel'.
It is thought the shirt references a 1979 song title by English rock band XTC, but the addition of a guillotine suggests a darker statement.
Mr Farage tonight called for the Green leader to be arrested.
The Daily Mail understands Reform UK is in the process of reporting Mr Polanski to police, while Alex Wilson, Reform UK leader on the London Assembly, will be raising a complaint to the Greater London Assembly.
Just hours after it appeared, Mr Polanski removed the post, with a Green party spokesman stating he does not 'support' this 'dangerous message'.
However, the original post is tonight being shared widely on social media.
Mr Farage, 62, retweeted the image on X, writing: 'This is what Zack Polanski has just posted on his Instagram.
'If I was to post anything as inciteful then I would expect to be arrested, and so should Polanski.'
Nigel Farage has called for Zack Polanski to be arrested after the Green Party leader shared a photograph of a man wearing a T-shirt 'planning his decapitation'
Daily Mail understands Reform UK is in the process of reporting Mr Polanski to police over the post, which has since been removed
The party told The Daily Mail the post was 'staggering' given that it appeared just days after the brutal killing of Reform UK spokesperson Ann Widdecombe in her own home
Zack Polanski has deleted the post, which the Green Party said was part of a 'collaboration'
Reform shadow home secretary Zia Yusuf told the Daily Mail the post was 'staggering' given that it appeared just days after the brutal killing of Reform UK spokesman Ann Widdecombe in her own home.
He said: 'Zack Polanski has posted to his 713k Instagram followers a photo of a man in a T-shirt depicting the beheading of Nigel Farage.
'To do this just two weeks after our friend Ann was murdered is staggering. This is incitement to murder.
'It should be treated as such by the police.'
Lord Walney, the government's former adviser on political violence, called the post 'sickening'.
He told the Daily Mail: 'There must be serious consequences for Zack Polanski after he shared material implying the assassination of another politician.
'This would be sickening and unacceptable at any time but it is even more serious in the present environment in which a senior Reform member has been brutally killed.
'The Green Party must be barred from participating alongside mainstream parties if it fails to take action against its leader.'
A Green Party spokesman said the post had now been deleted and had appeared as part of a social media 'collaboration'.
They said: 'After attending a public event, Zack accepted a request to collaborate on a post with several images.
'Once this image was brought to his attention he immediately unshared the post. He unequivocally does not support this type of dangerous message.'
Former Tory MP and Reform UK figure Ms Widdecombe was found dead in her remote bungalow in Dartmoor on July 9.
Prosecutors told a court last week she had been hit with a hammer 21 times as she ate her lunch.
Joshua Kerry, 28, from South Yorkshire, has been charged with the 78-year-old's murder and remanded in custody ahead of the next hearing on October 9.