The Vatican said today the Pope was sorry Muslims had been offended by a speech whose meaning had been misconstrued, but Morocco withdrew its ambassador as anger at his words flared on.
"The Holy Father thus sincerely regrets that certain passages of his address could have sounded offensive to the sensitivities of the Muslim faithful," Vatican Secretary of State Cardinal Tarcisio Bertone said in a statement.
Pope Benedict's first big crisis since his election 17 months ago was sparked by a speech in his native Germany on Tuesday that seemed to endorse a Christian view, contested by most Muslims, that early Islam was spread by violence.
The backlash has cast doubt on a planned visit to Turkey by the Pope in November.
High-ranking Vatican source
In an early reaction to the Vatican statement, Egypt's Muslim Brotherhood said it was not enough. "We feel he has committed a grave error against us and that this mistake will only be removed through a personal apology," the Brotherhood's deputy leader, Mohammed Habib, said. .
Morocco's King Mohammed recalled his ambassador to the Vatican in protest.
The Pope's next scheduled public appearance is his Sunday Angelus blessing, when he often comments on current affairs.
Cardinal Bertone, walking into the crisis only a day after taking over as "deputy pope", said the 79-year-old Pope confirmed "his respect and esteem for those who profess the Islamic faith" and hoped his words would be understood "in their true sense".
The academic speech was meant as a "a clear and radical rejection of religiously motivated violence, wherever it comes from", said the statement, which came as criticism of the leader of the world's 1.1 billion Roman Catholics swelled.
Prime Minister Tayyip Erdogan of Muslim Turkey said today before the Vatican statement that the Pope's comments were "ugly and unfortunate" and should be withdrawn. "The Pope spoke like a politician rather than as a man of religion," he said in televised remarks.
Asked if the Pope should cancel or postpone a planned trip to Turkey in November, he said: "I do not know."
Yemen's president publicly denounced the pontiff and five churches - only one of them Catholic - were attacked in the West Bank, although no one was hurt.
Egypt's foreign ministry summoned the Vatican envoy to Cairo to express "extreme regret" at Benedict's speech.
But Chancellor Angela Merkel and other German politicians defended his comments, saying he had been misunderstood. "It was an invitation to dialogue between religions," she told the mass-circulation Bild newspaper in an interview.
In the speech, the Pope referred to criticism of the Prophet Mohammad by 14th century Byzantine Emperor Manuel II Palaeologus, who said everything Mohammad brought was evil "such as his command to spread by the sword the faith he preached".
Using the terms "jihad" and "holy war", the Pope said violence was "incompatible with the nature of God". But Cardinal Bertone said the Pontiff "had absolutely no intention" of presenting Emperor Manuel's opinions on Islam as his own.
Vatican insiders and diplomats say the Pope may have mixed up his new role with his former posts as a theologian and head of the Congregation for the Doctrine of the Faith, when as Cardinal Joseph Ratzinger he was known as a disciplinarian.
Angry Muslim leaders flung what they saw as allegations of violence back at the Christian West. "How can (the Pope) imply that Muslims are the creators of terrorism in the world while it is the followers of Christianity who have aggressed against every country of the Islamic world?" prominent Saudi cleric Salman al-Odeh said. "Who attacked Afghanistan and who invaded Iraq?"
In Libya, the General Instance of Religious Affairs said the "insult ... pushes us back to the era of crusades against Muslims led by Western political and religious leaders".
Turkish paper Vatan quoted a member of the ruling Justice and Development Party saying Benedict "will go down in history in the same category as leaders like Hitler and Mussolini".
Catholic bishops in Turkey feared the angry local reaction, led by the Grand Mufti, could show public opinion was shifting against the Pope's planned visit. But Turkish officials said they hoped the row would blow over and the visit would go ahead.
In Iraq the government asked Muslims not to take their anger out on the small Christian minority, after the door of a church in Basra was attacked. The foreign ministry summoned the Vatican's top diplomat there to explain the Pope's comments.
A high-ranking Church source today expressed fears for the Pope 's safety, saying: "While I think the controversy will go away, it has done damage and if I were a security expert I'd be worried."