The rantings of the man who murdered at least 76 people in Oslo last Friday, single out Rainham MP Jon Cruddas for leading the Labour Party’s campaign against extremists in 2008.

Anders Breivik, who has admitted killing 68 children at a youth camp on Ut�ya island, after detonating a bomb leaving seven dead in Oslo, wrote a rambling 1,500 page “manifesto” of his beliefs before carrying out the atrocity.

A section which claims that the British authorities are encouraging anti-Semitic attacks in the UK, offers as ‘proof’ that: “Prime Minister Gordon Brown who collaborates with the Saudis appointed Jon Cruddas MP to spearhead a campaign against the far right.”

Mr Cruddas said that he could not comment of the contents of Breivik’s “manifesto” until he had more information.

He said: “The events in Norway against the young Labour Party members were terrible and I know everyone in the borough will be appalled by what we have seen over the weekend.”

The then Dagenham MP has been the representative of the Dagenham and Rainham constituency since the 2010 General Election.

It has been reported that police are investigating Breivik’s links with extremists in the UK, after he claimed he was inspired by two people he met in London in 2002.

Prime Minister David Cameron said on Monday: “We are still investigating these claims, so I don’t want to give out partial information. We want to get to the bottom of this before making public announcements. But we take these things extremely seriously.”

Foreign Secretary William Hague confirmed a UK police officer is helping Norwegian investigators who are looking into Breivik’s possible contacts.