Pope Benedict faces a growing chorus of demands to make an unequivocal apology for remarks seen as portraying Islam as a violent faith, despite attempts by Western leaders and churchmen to defuse the crisis.
The calls came as it emerged papal hitman Mehmet Ali Agca, who is serving a life sentence for the attempted assassination of Pope John Paul II in May 1981, has written to Pope Benedict XVI from jail, warning him not to go to Turkey as planned in November in the light of his remarks.
Agca, a Turk gave his ominous warning in a letter to an Italian daily newspaper.
For many Muslims, the Pope's attempt to explain himself on Sunday did not go far enough and observers were waiting to see if he would speak about it again at his general audience at the Vatican.
The Pope enraged Muslims in a speech a week ago in Germany quoting 14th century Byzantine Emperor Manuel II Palaeologus, who said everything the Prophet Mohammad brought was evil "such as his command to spread by the sword the faith he preached".
The leader of the world's 1.1 billion Roman Catholics said on Sunday he was 'deeply sorry' for the reaction caused - but stopped short of apologising for his words or retracting them.
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