Labour MPs Wes Streeting and John Cryer have asked for an investigation into a website, which Mr Streeting says “has the potential to cause a repeat of the Norway massacre”.

According to The Guardian, six opposition MPs, including Ilford North MP, Mr Streeting, and Leyton and Wanstead MP, Mr Cryer, wrote to the director of public prosecutions (DPP) asking whether The Gates of Vienna website breaks the law.

The website heavily promotes an exhibition in central London, in September, containing cartoons of the prophet Muhammed, which could be designed to incite Islamist violence.

The event has been organised by former Ukip parliamentary candidate Anne-Marie Waters.

Mr Streeting told the Recorder: “It is really clear that the website makes no bones about being a far-right website designed to incite hatred against Muslims.

“It has the potential to cause a repeat of the Norway massacre with Anders Breivik and that is why I have referred it to the DPP.”

The name of the website refers to a battle in 1683 between Europeans and Muslim Ottoman forces.

It details how anti-Muslim paramilitary groups could operate in a future war against Islam.

Mr Streeting said there was no difference between this website - believed to be hosted on British servers - and a jihadi training page.

He explained: “As the tragic events in Norway show, we cannot be complacent about the far-right.

“We need to treat this as we would treat a ISIL training website and get it shut down.”