continued: http://www.bbc.com/news/world-europe-30835625Pope Francis has defended freedom of expression following last week's attack on French satirical magazine Charlie Hebdo - but also stressed its limits.
The pontiff said religions had to be treated with respect, so that people's faiths were not insulted or ridiculed.
To illustrate his point, he told journalists that his assistant could expect a punch if he cursed his mother.
The remarks came as funerals were held for four people killed in the attack by militant Islamists.
Friends and family paid last respects to cartoonists Bernard Verlhac, known as Tignous, and Georges Wolinski, as well as columnist Elsa Cayat and policeman Franck Brinsolaro.
Eight magazine staff, a visitor to the magazine, a caretaker and two policemen died in the attack. A policewoman and four people at a kosher supermarket died in separate attacks.
Al-Qaeda said it had directed the Charlie Hebdo attack.
The magazine was targeted for publishing cartoons of the Prophet Muhammad. It printed another cartoon of the Prophet on its front page after the attacks, angering some Muslims who say all depictions of the Prophet should be forbidden.
France has deployed thousands of troops and police to boost security in the wake of last week's attacks. There have been retaliatory attacks against Muslim sites around France.
Meanwhile the creator of the "Je suis Charlie" slogan, which became a symbol of support for Charlie Hebdo, has applied for a patent, saying that he wants to prevent the commercial exploitation of the design and keep its original message intact.
'You cannot provoke'
Speaking to journalists flying with him to the Philippines, Pope Francis said last week's attacks were an "aberration", and such horrific violence in God's name could not be justified.
He staunchly defended freedom of expression, but then he said there were limits, especially when people mocked religion.
"If my good friend Doctor Gasparri [who organises the Pope's trips] speaks badly of my mother, he can expect to get punched," he said, throwing a pretend punch at the doctor, who was standing beside him.
"You cannot provoke. You cannot insult the faith of others. You cannot make fun of the faith of others. There is a limit."
Earlier President Francois Hollande vowed to protect Muslims who, he said, were the main victims of fanaticism, along with people of other religions.
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So, would the Pope condone Catholics acting in the same way as the Paris attackers?
