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			 Leaks of such detailed information about Islamic State are rare 
			and give Britain's spies a potential trove of data that could help 
			unmask militants who have threatened more attacks like those that 
			killed 130 people in Paris last November. 
			 
			A man calling himself Abu Hamed, a former member of Islamic State 
			who became disillusioned with its leaders, passed the files to 
			Britain's Sky News on a memory stick he said he had stolen from the 
			head of the group's internal security force. 
			 
			On it were enrolment forms containing the names of Islamic State 
			supporters and of their relatives, telephone numbers, and other 
			details such as the subjects' areas of expertise and who had 
			recommended them. 
			 
			One of the files, marked "Martyrs", detailed a group of IS members 
			who were willing and trained to carry out suicide attacks, Sky said. 
			 
			Richard Barrett, a former head of global counter-terrorism at 
			Britain's MI6 Secret Intelligence Service, said the cache was "a 
			fantastic coup" in the fight against Islamic State. 
			  "It will be an absolute goldmine of information of enormous 
			significance and interest to very many people, particularly the 
			security and intelligence services," Barrett told Sky News. 
			 
			Sky said it had informed the British authorities about the documents 
			which were passed to its correspondent, Stuart Ramsay, at an 
			undisclosed location in Turkey. 
			 
			Western security sources said that if genuine, the files could be 
			gold dust as they could help identify potential attackers and the 
			networks of sympathizers behind them, and give insight on the 
			structure of the group. 
			 
			Reuters was not able to independently verify the documents, given 
			their provenance. A selection of them was published in Arabic. 
			 
			Islamic State militants claimed responsibility for the Nov. 13 
			attacks in Paris and the Oct. 31 downing of a Russian passenger 
			plane over Egypt's Sinai region that killed 224. They have promised 
			more attacks on the West and Russia. SUICIDE BOMBERS 
			  
			 Western leaders say Islamic State, which has proclaimed a caliphate 
			in the parts of Syria and Iraq it controls, now poses a greater 
			danger to the West than al Qaeda. It uses a militant interpretation 
			of Islam to justify attacks on its foes and the use of extreme 
			violence, including rape and beheadings, against those it sees as 
			infidels. 
			 
			
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			The defector, a former Free Syrian Army fighter who switched to 
			Islamic State, said the group had been taken over by former soldiers 
			from the Iraqi Baath party of Saddam Hussein, who was ousted in 2003 
			after the U.S.-led invasion of Iraq. 
			 
			Some of the defector's Arabic documents, posted on the Zaman Al Wasl 
			Syrian news website, were forms issued by "Islamic State in Iraq and 
			Sham, the General Directorate of Borders" and displayed personal 
			details of each fighter, according to a review of some of the 
			documents by Reuters. 
			 
			The forms included answers to 23 questions such as assumed name, 
			birthplace, education level, extent of Sharia learning and previous 
			jobs, as well as details about the individuals' journey to Islamic 
			State and whether they were potential suicide bombers or more 
			traditional fighters. 
			 
			When asked for his view of the documents, Raffaello Pantucci, 
			director of international security studies at London's Royal United 
			Services Institute, said in an emailed response: "It seems a bit 
			dated." 
			 
			"Very interesting though and a real gift for researchers into 
			understanding the group more," he added. "The key for me in many 
			ways is how this highlights the bureaucracy of the organization once 
			again - kinda like al Qaeda in fact." 
			 
			(Additional reporting by Estelle Shirbon in London and Mark 
			Hosenball in Washington; Editing by Mark Trevelyan) 
			
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