Nigel Farage said he would 'take the knife to the pen pushers in Whitehall' at a Brexit Party rally in Wales

Police are investigating after Nigel Farage said he would 'take the knife to the pen pushers in Whitehall' at a Brexit Party rally in Wales.

He told the Newport audience: 'Once Brexit is done, we will take the knife to the pen pushers in Whitehall.'

Alliance Party MEP Naomi Long tweeted calling for police to investigate Farage for his comments.

She said: 'Can you confirm that you intend to investigate this clear case of incitement to violence against staff in the Civil Service? Thank you.'

Gwent Police, which operates in Newport, replied to say: 'We have been made aware of comments made last night in Newport and we are looking into these allegations.'

Farage's comments come amid growing fears about the language used by politicians.

Just yesterday former home secretary Amber Rudd accused Boris Johnson of being 'immoral' and using language that 'incites violence'.

Johnson said Remainer MPs were 'betraying' the people and describing their bid to delay Brexit as the 'Surrender Act'.

Alliance Party MEP Naomi Long tweeted calling for police to investigate Farage for his comments

She told the Evening Standard: 'The sort of language I'm afraid we've seen more and more of coming out from Number 10 does incite violence.

'It's the sort of language people think legitimises a more aggressive approach and sometimes violence.'

Earlier this week Farage tweeted his support for Johnson and said he was right to use words like surrender and betrayal.

And last month he was accused of giving a speech that 'barely concealed his racism' by Labour MP Stephen Doughty.

Gwent Police tweeted to confirm they were investigating the allegations that Farage had been inciting violence in his comments

During the speech to Conservative Political Action Conference in Sydney, Australia, Farage told the audience that Prince Harry had 'fallen off a cliff' since meeting Meghan Markle.

And earlier this year Farage demanded for police to take action when comedian Jo Brand when she made a joke about throwing battery acid on him.

He claimed she was 'inciting violence'.