A EURO MP from East Lancashire has reacted with dismay after discovering that a UKIP ‘supporter’ who apparently issued threats against him on Twitter will not be charged.

Former Nelson solicitor Sajjad Karim, who lives in the Ribble Valley, has also called for the Crown Prosecution Service decision to be reviewed after being informed the authority had dropped the case, which emerged just days after the Batley MP Jo Cox was murdered.

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North Yorkshire Police arrested a 55-year-old Harrogate man after a vitriolic social media exchange with the North West Conservative MEP.

But last weekend Mr Karim received a letter from a detective in the case, who told him that the CPS had decided not to proceed with the matter.

Mr Karim, 46, said: “ Even the officer who wrote the letter said that he was taken aback by the decision because after a discussion I had with him, the man had apparently made full admissions in his interview.

“I have asked for a full explanation of the decision and an overview of the case so we will see what comes from that.”

Earlier on Twitter he had reposted a copy of the 55-year-old’s original Twitter message and said: “It’s ok in UK to threaten a publicly elected Parliamentarian EVEN when u admit it under arrest. WHY?”

Pendle MP Andrew Stephenson said: “I am deeply disappointed that the CPS is not pressing charges because things like this need to be taken seriously by the authorities, when MPs or MEPs are going about their lawful business and representing the electorate, and are threatened in this way.”

The Harrogate man was accused of making threats against Mr Karim if then UKIP leader Nigel Farage was harmed in any way.

A tweet said: “We know where to come if anything happens to him”, followed by a religious slur and a threat to “come round to his house.”

In the same exchange Mr Karim, who was born in Blackburn, was also called an “immigrant”.

The MEP was a prominent figure in the Remain camp, around the time of the European Union Referendum, which had sparked the row with the 55-year-old. He later withdrew from public discussions on the Brexit issue.

Speaking at the time, he said: “This week, I turned to one of my team members and said, “I’m not doing any more debates”, as tensions are running so high. I could feel that something bad was going to come out of it. And then of course we got the news about Jo Cox.”

The letter on the latest social media case, from a North Yorkshire officer named as Det Sgt David Carter, said that the investigator was “confused by the decision and am having to read the rationale in detail.”

Ribble Valley MP Nigel Evans said: “I hope that this will not be interpreted as a green light for people to feel that they are able to abuse elected officials on social media.

“I don’t believe there’s any place in our democracy for this kind of trolling. People should be able to promote their arguments, within our freedoms of speech, without having to resort to what I see was a ‘freedom of threats’.”

Mr Evans said although the party colleagues were on different side of the Referendum debate he would be appalled if any Leave campaigner had descended to such abuse.

Mr Karim was the subject of far-right intimidation in July 2011, after the English Defence League staged a halal meat protest outside his then-home in Simonstone, while his wife and young family were inside. He later moved.

A CPS spokesman said: “We have advised that this matter should not be proceeded with to prosecution because there was no realistic prospect of a conviction. The person who made the complaint can ask for that decision to be reviewed under our victim right to review procedures.”

North Yorkshire Police was unavailable for comment last night.