Aziz has been accused of committing war crimes in his hunt for fanatics and their supporters – but he has defended his actions, insisting: ‘Every day, I swear, I slaughter them, as they’ve slaughtered us.’
He added: ‘You don’t know what you’re going to do. What they did to us, we must do to them.’
According to the Swedish news website Expressen which spoke to Aziz, other videos show him walking around with Iraqi troops, carrying a severed head.
Separate footage shows blindfolded men sitting on the floor with their hands tied behind their backs and hoods over their heads being beaten with batons and whips.
Another prisoner can be seen being suffocated by someone’s hands over his mouth.
In the beheading footage, Aziz, who walks around in military boots and wears the same brand of jacket worn by a lot of Iraqi troops, can be heard crying: ‘The knife has done its work!’
Nobody attempts to stop him and some even cheer once he has finished, describing him as ‘the who’s slaughtering ISIS’. He responds, telling the camera: ‘This is your blood, you dogs.’
Speaking to Expressen, he said the beheaded man had been captured in a toilet block. He told war correspondent Magda Gad how it felt to cut someone’s head off.
‘Just that feeling, I can’t explain how at ease I am with it,’ he said.
After watching the footage, Donatella Rovera from Amnesty told Expressen it showed ‘war crimes being committed’ and called on Iraqi authorities and the international community to investigate.
But Aziz said: ‘They (ISIS) have driven us to it. What they’ve done has killed our compassion. Finding your brother slaughtered, or your mother slaughtered. What are you going to do? You don’t know what you’re going to do. What they have done to us, we must do to them.’