Former Guantanamo Bay detainee and Islamic fighter Abu-Zakariya al-Britani detonated a car bomb outside an Iraqi base in Tal Gaysum, south-west of Mosul on Monday.
The Islamic man was filmed, smiling, as he drove a clumsily converted vehicle packed with explosives towards the Iraqi compound.
He had been captured in the Middle East by the United States in 2001, before being sent to Guantanamo Bay, according to the BBC. The British-born man was freed from the detention center in 2004 and was given £1 million from the British taxpayers on the grounds that he was tortured, according to another report.
Al-Britani left Britain in 2014 and re-joined his Islamic brothers to fight and kill non-believers. Nearly 850 British citizens have joined Islamic regimes in the last decade.
He wrote about his time in Guantanamo Bay in a letter to the University of California-Davis Center for the Study of Human Rights:
"During my imprisonment by the United States Forces, I was deprived of access to my friends and family. I was never allowed any legal advice and never informed of any specific allegations or charges against me. I was repeatedly questioned to try to make me confess to something I had not done. My impression was that my interrogators were not interested in whether they obtained the truth from me but were simply intent on trying to make me confess. I refused to do so as I maintained my belief in myself and my innocence throughout this very difficult period...."