Mohammed Emwazi told a journalist at the newspaper in an email that he felt like a ‘dead man walking.’
The fate of those kidnapped, almost all of them Assyrian Christians, remains unclear.
His father also a British national, currently works in Kuwait and is expected to be summoned by authorities.
His ex-teacher said Emwazi needed help controlling his emotions but his therapy was considered a “success story”.
The video shows them using a jackhammer to deface a large Assyrian winged bull at a huge archaeological site in Mosul.
The video was posted on social media accounts affiliated with the Islamic State group.
The news outlets said Emwazi was known to Britain’s intelligence services before he traveled to Syria in 2012.
IS militants attacked communities nestled along the Khabur River, seizing dozens of people, many of them women and children.
“ISIL continues to exact its evil upon innocents of all faiths, and the majority of its victims have been Muslims,” said US.
18-year-old man becomes the first known South Korean to join the Islamic State group.
New Zealand will send a small number of troops to Iraq to train forces against the Islamic State group.
Syrian Kurdish forces advanced against Islamic State fighters in two separate attacks in northeastern Syria near the Iraqi border.
A bomb blast outside the Iranian ambassador’s house in Libya was claimed by militants affiliated with the Islamic State group.
He carries a $10 million bounty on his head.
Turkey and the United States signed an agreementto train and arm Syrian rebels fighting the Islamic State group, said the US Embassy in Ankara.
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