'British IS bomber' Ronald Fiddler was former Guantanamo detainee

In a statement, the terrorist organization announced, "The martyrdom-seeking brother Abu Zakariya al-Britani - may Allah accept him - detonated his explosives-laden vehicle on a headquarters of the Rafidhi army and its militias in Tal Kisum village, southwest of Mosul".

The "al Britani" name is often used by the extremist group to indicate a fighter's British background.

He was released from Gitmo in 2004.

He was suspected of terrorism by the Americans but freed from the USA detention centre in 2004 after lobbying by the British government.

However, a statement to the BBC on behalf of the family said they believed the claimed figure of £1 million was wide of the mark and referred to a group settlement made to four ex-detainees - including al-Harith - and included their costs.

Mr Blair decided to make a statement on the matter after a news story in which a Tory MP attacked his "flawed judgement" over Harith, in particular citing the compensation paid to him.

"It is time to stop the thinking that there is good in everyone and realise that there are people out there that wish to do us harm".

On the issue of compensation, he said: "This was settled not by us but by Ken Clarke, my successor as justice secretary". The payout was arranged in 2010, when the Conservative Party's David Cameron was prime minister.

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He later joined Isis and is said to have blown himself up at an Iraqi army base in Mosul this week.

Arthur Snell, the former head of Prevent, the United Kingdom government's counter-terrorism program, told BBC Radio 4, "It's obvious that collectively the authorities - and obviously I have some personal responsibility there - we failed to be aware of what Fiddler was up to".

Originally the Muslim convert was from the Moss Side area of Manchester and was the father of five children.

It is correct that Jamal al-Harith was released from Guantanamo Bay at the request of the British government in 2004.

Iraqi troops have been fighting to liberate Mosul from ISIS control since October with support from British and other coalition air strikes.

According to figures published by the British Government a year ago, around 850 individuals of "national security concern" have travelled to fight with ISIS in Iraq and Syria.

"Just under half are thought to have returned to Britain while 15 per cent are believed to have been killed", notes the Telegraph.

  • Megan Austin