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Theresa May has buried a long-awaited report that's feared to expose Saudi funding of British extremism for 'national security reasons'.

There is an outcry after Home Secretary Amber Rudd confirmed the Prime Minister had blocked the report - instead publishing a brief summary that claims most terror funding comes from within the UK.

Lib Dem leader Tim Farron said: "This decision is utterly shameful. I believe that sunlight is the best disinfectant."

Green Party leader Caroline Lucas accused the government of trying to "fob us off", adding: "The Government's refusal to publish this report, and this utterly vague statement, are completely unacceptable.

"The statement gives absolutely no clue as to which countries foreign funding for extremism originates from - leaving the Government open to further allegations of refusing to expose the role of Saudi Arabian money in terrorism in the UK."

The report was commissioned by David Cameron in 2015 and was widely expected to embarrass Britain's Saudi allies.

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After last month's London Bridge terror attack Jeremy Corbyn claimed Saudi Arabia had "funded and fuelled extremist ideology".

Labour's leader added it was time for "difficult conversations" with the oil-rich Gulf state, which Tory ministers say is a key ally in the fight against terror in the region.

And Shadow Foreign Secretary Emily Thornberry said "the funding of some of our mosques and the connection in relation to some very rich Saudi Arabian business people" should be looked at.

But Ms Rudd said: "Having taken advice, I have decided against publishing the classified report produced during the review in full.

"This is because of the volume of personal information it contains and for national security reasons."

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The government has previously been accused of reluctance to criticise Saudi Arabia and has separately continued arms sales to the country, which were ruled legal by the courts despite fears they are used to kill civilians in Yemen.

Today's 585-word summary by Ms Rudd does not single out any individual country.

Instead it says Islamist extremist organisations are receiving hundreds of thousands of pounds a year, mainly made up of small, anonymous public donations from UK-based individuals.

It adds: "For a small number of organisations with which there are extremism concerns, overseas funding is a significant source of income.

"However, for the vast majority of extremist groups in the UK, overseas funding is not a significant source.

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"Overseas support has allowed individuals to study at institutions that teach deeply conservative forms of Islam and provide highly socially conservative literature and preachers to the UK’s Islamic institutions.

"Some of these individuals have since become of extremist concern."

Other findings include that some Islamic organisations of concern are posing as charities to increase their credibility and to take advantage of Islam's emphasis on charity.

Ms Rudd said the donors may not know or support the organisations' full agenda.

Senior MPs in the Privy Council, including Jeremy Corbyn , will be able to review the classified report but not reveal its contents.