Almost half of French oppose publication of cartoons depicting Islam's Prophet Mohammed, according to a poll Sunday, as global debate deepened on the limits of free speech in the wake of the Charlie Hebdo killings.

The Ifop poll found 42 percent believe Mohammed cartoons seen as offensive by many Muslims should not be published. Fifty percent said they backed "limitations on free speech online and on social networks."

Scores of people paid tribute on Saturday in the Tunisian capital to Yoav Hattab, the son of a Tunis rabbi murdered in last week's jihadist attack on a Paris kosher supermarket.

Gathered outside Tunis's Grand Synagogue, around 150 people carried candles and pictures of Hattab, placing them between two Tunisian flags.

Iran has banned reformist newspaper Mardom Emrouz for publishing on its front page the headline "I am Charlie", state news agency IRNA reported Saturday.

It said the slogan, which has come to symbolize the fight for freedom of expression after last week's deadly attack on the French satirical magazine Charlie Hebdo in Paris, was published next to a picture of Hollywood star George Clooney who had said "I am Charlie" at a recent event.

Around 15,000 people on Saturday rallied in Russia's Muslim North Caucasus region of Ingushetia against Western publications that insult the Prophet Mohammed, authorities said, in the wake of the Charlie Hebdo attack in France.

The crowd gathered for the officially sanctioned meeting in the regional capital Magas to protest "against cartoons of the prophet, Islamaphobia and insulting the beliefs of Muslims," the local government's press service told AFP.

Traffic was suspended in both directions in the Channel Tunnel between Britain and France on Saturday after a lorry fire, authorities said.

"Due to an incident in the tunnel, all departures are currently suspended in both directions," Eurotunnel said.

Shiite militiamen in control of Yemen's capital seized President Abdrabuh Mansur Hadi's chief of staff Saturday in a new challenge to his leadership of the violence-plagued country.

The abduction of Ahmed Awad bin Mubarak, who heads a "national dialogue" on Yemen's political transition, came shortly before he was to attend a meeting on a proposed new constitution opposed by the Huthi militia.

President Francois Hollande stressed on Saturday that France was committed to "freedom of expression" after fresh violence broke out in Niger at a rally against French satirical magazine Charlie Hebdo.

Meanwhile, jittery European nations stepped up security in the wake of last week's attacks in France that claimed 17 lives.

Protest graffiti was sprayed outside the French cultural centre in Gaza before dawn Saturday following the publication of a new cartoon of the Prophet Mohammed by satirical magazine Charlie Hebdo.

"You will go to hell, French journalists," read one of the slogans daubed on the walls of the cultural centre compound, which has been closed since it was damaged in a fire last October.

When top U.S. diplomat John Kerry rushed towards the French president, arms open, to warmly embrace him on Friday, what followed was a cringeworthy culture clash that has befuddled many a visitor to France.

The French are just not that into hugging.

The head of al-Mustaqbal Movement ex-premier Saad Hariri reportedly transferred compensations for the residents of the northern neighborhood of Jabal Mohsen who were harmed by the latest bombing in the area.

According to al-Akhbar newspaper published on Saturday, the money was transferred to the Interior Ministry, which will supervise the spending.