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A minute's silence will be held across France to remember the victims of the gun attack at the office of satirical magazine Charlie Hebdo.
It comes after vigils were held in cities across the globe to mourn the victims of the attack in Paris and show support for freedom of speech.
President Francois Hollande has ordered flags to fly at half-mast for three days.
After the minute of silence at midday, the bells of Paris' Notre Dame cathedral will sound out across the city.
"Nothing can divide us, nothing should separate us," Mr Hollande said.
"Freedom will always be stronger than barbarity," said the president, who called for "national unity".
More than 35,000 people gathered in the French capital on Wednesday, after gunmen stormed the offices of the magazine, killing 10 journalists and two police officers.
Thousands also turned out in the French cities of Lyon, Toulouse, Bordeaux and Marseille.
Many of those at the Place de la Republique in the French capital carried signs with the words "Je Suis Charlie", which means "I am Charlie" in English.