World leaders are gathering in Paris ahead of a huge march in the French capital to show unity after three days of terror that left 17 people dead.
Some 40 leaders are to go to the rally, expected to dwarf Saturday’s marches that saw 700,000 take to the streets.
About 2,000 police officers and 1,350 soldiers are being deployed across the French capital to protect marchers.
Police are seeking accomplices of the gunmen who attacked a satirical magazine and a kosher supermarket.
The interior minister says France will stay on high alert in the coming weeks.
Bernard Cazeneuve will host a meeting on Sunday morning of fellow interior ministers from across Europe, including the UK’s Theresa May, to discuss the threat posed by militants.
Mr Cazeneuve promised “exceptional measures” for the massive unity march in Paris on Sunday, including positioning snipers on roofs.
The foreign leaders expected to attend the rally include UK Prime Minister David Cameron, German Chancellor Angela Merkel, Palestinian leader Mahmoud Abbas and Israeli Prime Minister Benjamin Netanyahu.
The march, which will be led by relatives of the victims of last week’s attacks, will leave Place de la Republique at 15:00 local time (14:00 GMT).
More than a million people are expected to take part, the BBC’s Chris Morris in Paris reports.
Before the march, President Francois Hollande will meet leaders from the Jewish community, which is still in shock after a gunman killed four people at a kosher supermarket in eastern Paris on Friday.
The gunman, Amedy Coulibaly, is believed to have shot dead a policewoman the day before.
In a separate attack on Wednesday, two brothers raided the offices of the satirical magazine Charlie Hebdo.
Cherif and Said Kouachi killed 12 people – including eight journalists and two police officers – in the attack. Eleven people were also injured.
Coulibaly and the Kouachi brothers were shot dead on Friday after police ended two separate sieges.
Police are still hunting for accomplices of the three gunmen, including Hayat Boumeddiene, Coulibaly’s partner. However, officials in Turkey believe she may have travelled through the country en route to Syria earlier last week.
Meanwhile, police in Germany say there has been an arson attack at the offices of a newspaper that reprinted Charlie Hebdo cartoons of the Prophet Muhammad.
No-one was hurt in the assault on the Hamburg Morning Post in the early hours of Sunday, according to reports.
‘Act of barbarity’
Relatives of the victims spoke out about the France attacks on Saturday.
The family of Ahmed Merabet, one of the police officers killed during Wednesday’s attack on the Charlie Hebdo magazine, said they were “devastated by this act of barbarity”.
Mr Merabet was “Muslim, and very proud of being a police officer and defending the values of the Republic”, his brother Malek Merabet said at a news conference.
Meanwhile, the family of gunman Amedy Coulibaly has also condemned the attacks.
In a statement, Coulibaly’s mother and sister offered “sincere condolences” to the families of the victims, and said: “We absolutely do not share these extreme ideas. We hope there will not be any confusion between these odious acts and the Muslim religion.”
Nearly a quarter of a million people held marches in France on Saturday to condemn the attacks, with large crowds gathering in Paris, Orleans, Nice, Pau, Toulouse and Nantes.
During the marches, people held banners that read “I am against racism”, “unity”, or “I am Charlie” – the latter a reference to the magazine.
Addressing a large gathering outside the kosher supermarket that was targeted, Prime Minister Manuel Valls said: “Today, we are all Charlie, we are all police officers, we are all Jews of France.”
He said he had “no doubt that millions of citizens will come to express their love of liberty, their love of fraternity” in Paris on Sunday.