Archbishop Desmond Tutu will challenge British Prime Minister Mr Tony Blair and US President Mr George W. Bush to apologise for their "immoral" war in Iraq.
In a speech he is to give in London later today, the Nobel prize winner will say the turmoil after the war proved it is an illusion to believe that "force and brutality" leads to greater security, the Independentreported today.
It said Dr Tutu would ridicule the "dangerously flawed" intelligence Britain and the United States used to justify military action in Iraq.
"An immoral war was thus waged and the world is a great deal less safe place than before," the paper quoted him as saying.
"It is large-hearted and courageous people who are not diminished by saying 'I made a mistake'. President Bush and Prime Minister Blair would recover considerable credibility and respect if the were able to say, 'Yes we made a mistake'", Dr Tutu said.