One of the alleged killers of Fusilier Lee Rigby told detectives the soldier was struck in the neck until his head "almost detached", a court has heard.
Michael Adebolajo, 28, is accused of hacking Fusilier Rigby to death with a meat cleaver and knives, along with Michael Adebowale, 22, on May 22 near Woolwich barracks in south east London.
During police interviews played to the jury at the Old Bailey, Abebolajo, covered by a blue blanket, said there was a "war between the Muslims and the British people" and he was a "soldier of Allah".
Asked what happened to Fusilier Rigby, Adebolajo said: "He was struck in the neck with a sharp implement and it was sawed until his head, you know, almost detached and may Allah forgive me if I acted in a way that is displeasing to him."
In an earlier interview, the murder suspect told officers the "leaders" of Britain were "wicked, corrupt, selfish and oppressive" and he was "particularly disgusted by David Cameron, the Miliband brothers and what's-his-name, Nick Clegg".
He added that people do not realise the "wickedness and corruption" of former prime minister Tony Blair.
Occasionally revealing his face to the camera's view, Adebolajo said: "It's for those people who have not yet understood the nature, the nature of the war that's ongoing and has been on going for some many years between the Muslims and the British people."
He went on: "The proof that this war between the people of Britain and the Muslims is that unfortunately it has to be interpreted in this way simply because your leaders, you have leaders who rule over you, unfortunately they rule over you in a very wicked, corrupt, selfish and oppressive manner."
Fusilier Rigby's widow, Rebecca, left the court in tears as the interviews were played.
Adebolajo discussed politicians gathering in the House of Commons and paying tribute to soldiers killed in Afghanistan "as a disgusting practice".
He said Prime Minister Mr Cameron was "trying to emulate the footsteps of Tony Blair as if he worships him".
Adebolajo told the detectives that British soldiers were being sent to "Muslim lands to commit mass murder".
He said: "The reality of Muslim land, it's full of men who, like myself, are soldiers of Allah."
Earlier in the interview with Dc Dhaval Bhatt and Dc David Field, sitting alongside his solicitor, Adebolajo said it "brings him little joy to approach anybody and slay them".
He said: "I'm British, I was born here."
"The very hospital in which Allah sent me to be treated was the very hospital I was born in," he said.
"Can you believe this?"
Adebolajo said he was ashamed to be called British because it was associated with the "murder, pillaging and rape of innocent people".
The court heard that Adebolajo sent Adebowale a text message on the morning of the alleged murder which read: "1 bruddas got d link for cheap thobes wana grab one wit man".