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David Cameron found himself at the centre of a foul-mouthed storm after he appeared to tell a member of parliament to ‘f*** off’ during Prime Ministers Questions.

The Prime Minister seemed to mouth the obscenity towards SNP member Angus Robertson when questioned about the planned referendum on Scotland’s independence.

Mr Cameron said: “Let me be clear about what we won’t do. We will not pre-negotiate Scotland’s exit from the United Kingdom.

“Frankly, it is his party who wants to break up the United Kingdom and it is for his party to make the case.”

But, before he returned to his seat, the PM appeared to mouth the words “will you f*** off” as the Speaker called the next MP to the microphone.

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Within minutes, Twitter was flooded with viewers claiming to have seen Mr Cameron's foul-mouthed outburst.

User Matt Dilworth wrote: "So apparently David Cameron mouthed the words "will you f*** off" in parliment today. It seems he mirrored my feelings toward HIM perfectly!" (sic)

Daniel Barker tweeted: "Um... I think David Cameron silently told some MP to f*** off at #PMQs."

Mr Robertson himself played the incident down, sending a message on Twitter: "Didn't hear David Cameron use unparliamentary words in PMQs.

"Shame he didn't commit to all Electoral Commission recommendations."

Downing Street insisted that Hansard, the official record of parliamentary proceedings, would make clear that Mr Cameron did not swear.

Asked if she could deny that the PM swore, a Number 10 spokeswoman said: "Absolutely. I think he said 'What are you frightened of?'"

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It is not the first time the PM has ruffled feathers during PMQs.

In April 2011, Mr Cameron sparked a sexism row by telling Labour’s Angela Eagle to “calm down, dear”.

The patronising PM blurted out the phrase, made famous by Michael Winner’s car insurance TV adverts, as he was heckled on the NHS.