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A Labour MP has been threatened with being “gunned down” on the day a top policeman warned of a “creeping rise” in far-right extremism thanks to Brexit .

Shadow Communities Minister Melanie Onn shared on Twitter the message she received from a member of the public, calling herself Helen.

It read: “’You are a f****** traitor you silly f****** bitch.

“We will remember your actions you spineless s***. Watch your back or you will not be forgiven. TRAITOR.”’

The MP said the same person sent a follow-up email including the message: “The likes of you should be f****** gunned down.”

(Image: PA)

Great Grimsby MP Ms Onn, who came out against a second referendum earlier this week, added: “Everyone in Grimsby knows I’ve never backed down from a debate, even when I’ve had unpopular POV (point of view) (including in referendum), but we must be allowed to have an opinion without this nonsense.”

Jo Cox, who was Labour MP for Batley and Spen, was killed after being repeatedly shot and stabbed in Birstall, West Yorks, in June 2016.

Her killer, Thomas Mair, gave his name as “death to traitors, freedom for Britain” at his first court appearance.

Ms Onn’s comments came as Metropolitan Police Assistant Commissioner Neil Basu voiced concerns Brexit could lead to a “creeping rise” in far-right extremism.

“What’s most concerning me about Brexit is the potential to divide communities and set communities against each other,” he told the BBC.

“We have seen some of the behaviour from very, very small groups.

“If you think about what happened outside Parliament just before Christmas and just after Christmas, we had months of very peaceful, very lawful, no problems protest outside Parliament.

“Then a very small group of people managed to turn that atmosphere and that cannot be right. We must make absolutely sure that doesn’t happen.”

MPs from across the political spectrum have reported experiencing abuse in recent weeks.