A BRITISH ISIS fighter who blew himself up in a suicide attack on Iraqi troops in Mosul is a former Guantanamo Bay detainee who the UK Government lobbied to release — before handing him a £1MILLION compo.

Jamal Al-Harith, born Ronald Fiddler before his conversion to Islam in 1992, was filmed driving a death car packed with explosives at an army position near the ISIS stronghold on Monday.

13 British ISIS fighter Jamal Al-Harith, who called himself Abu Zakariya al-Britani, smiles before killing himself in a suicide attack in Mosul Credit: Twitter

13 Ronald Fiddler changed his name to Jamal Al-Harith when he converted to Islam, before fighting with ISIS under the title Abu Zakariya al-Britani Credit: Corbis - Sygma

13 Fiddler had been held in Guantanamo Bay after US troops captured him in Afghanistan — but he was released two years later and handed £1million by the UK Government Credit: AP:Associated Press

The Manchester-born terrorist, 50, had been gifted a seven-figure taxpayers' sum after being released from the infamous US detention centre in 2004.

It followed a high profile campaign by the then Labour Home Secretary David Blunkett for him to be let out — just two years after he was captured by US troops in Afghanistan.

13 Jamal Al Harith pictured in Manchester, where he was born Ronald Fiddler Credit: Manchester Evening News

13 Al-Harith was given a massive compensation payout before travelling to Syria to fight with ISIS Credit: Camera Press

Mr Blunkett said at the time: "No one who is returned… will actually be a threat to the security of the British people.”

The dad-of-five had denied being an extremist, claiming he had been a Taliban hostage when he was picked up by American soldiers in Kandahar and taken to the high security prison in Cuba.

But after his release he fled the UK to fight in Syria as militants swept across the region in 2014.

It was only revealed he had gone to join ISIS when his British wife Shukee Begum fled the territory having failed to convince him to come home.

13 Fiddler, who changed his named to Jamal Al Harith, is pictured on the right with other former Guantanamo detainees Martin Mubanga and Moazzam Begg a year after his release Credit: Rex Features

13 Labour's then-Home Secretary David Blunkett had lobbied for Fiddler's release Credit: PA:Press Association

13 Shukee Begum, Al-Harith's British wife, revealed he had gone to Syria when she fled ISIS Credit: Channel 4

Who was Jamal al-Harith? MUSLIM convert Jamal al-Harith was freed from the infamous US detention centre in 2004 after then-Home Secretary David Blunkett campaigned for his release. At the time of al-Harith’s release from Guantanamo Bay, Mr Blunkett, said: “No one who is returned…will actually be a threat to the security of the British people.” The ex-Labour cabinet member initially opposed the return of British Guantanamo Bay detainees. He wanted the captives tried in American civil courts because he feared trials in the UK could collapse because of the conditions they were held in, in the United States. When al-Harith was released in 2004, he was repatriated to England and released without charge.

Chilling footage of his attack shows a pack of suicide cars stuffed with bombs and encased in armour travelling near Mosul.

It later shows another fighter cheering before he shuts the driver-side door and pulls off.

Moments later giant clouds of smoke can be seen in the distance.

At least two of the jihadis managed to reach a base west of the city where they detonated their explosives — killing and injuring a number of troops, the Iraqi soldiers said.

The extremists later released a statement saying: "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."

13 Al-Harith, third from right, was pictured in a photoshoot for The Guardian of ex-Guantanamo Bay detainees Credit: Andy Hall/The Guardian

13 Jamal Al-Harith, born Richard Fiddler, was killed attacking Iraqi troops in a suicide bombing Credit: Andy Hall/The Guardian

13 An explosive-laden death car drives towards an Iraqi forces base in Mosul

13 The bomb cars appear to be armoured and contain huge amounts of explosives

13 Clouds of smoke suggest the cars exploded although the amount of casualties has not been verified

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His brother Brian Jameson told The Sun: “Ronald’s a good bloke. He’s kind and caring — nothing like the man who would do this.

"I know he had become more extremist over the years but I spoke to him a few months back and he seemed just like the brother I knew. I’m devastated.”

The end of his fighting name — al-Britani — is commonly used by ISIS to identify jihadists from Britain.

But the Foreign Office has said due to the nature of the conflict it is unable to fully verify dead Brit fighters.

A spokesperson told The Sun: "As all UK consular services are suspended in Syria and greatly limited in Iraq, it is extremely difficult to confirm the whereabouts and status of British Nationals in these areas.”

It is estimated that about 850 British citizens have fled the country and travelled to Syria or Iraq to join the terror group.

Iraqi forces have been waging war with ISIS fighters in Mosul since last October, when a massive US-led offensive was launched to re-capture the terror stronghold.

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