President Francois Hollande has stressed that France is 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 have stepped up security in the wake of last week's attacks in France that claimed 17 lives.
Belgium began deploying hundreds of armed troops on Saturday to patrol the streets after security forces smashed a suspected Islamist "terrorist" cell planning to kill police officers.
And in London, authorities were mulling "further measures" to protect police "given some of the deliberate targeting of the police we have seen in a number of countries across Europe and the world," said Mark Rowley, head of counter-terrorism for the British police.
British police officers, for the most part unarmed, might be equipped with taser guns as part of reinforced security measures, according to the local press.
Meanwhile, French and Belgian authorities were grilling suspected accomplices both of the Paris gunmen and the alleged "terrorist" cell raided in eastern Belgium.
Belgian police were hunting for the suspected mastermind of the cell, a notorious 27-year-old jihadist who spent time in Syria and who may have prepared the foiled attack from bases in Greece and Turkey, according to local media.
And fresh protests against Charlie Hebdo, targeted in last week's attacks for its depiction of the prophet Mohamed, broke out for a second day running in Niger.
Police fired tear gas at around 1,000 youths outside the grand mosque in the capital Niamey, some of whom responded by hurling rocks, a day after a rally against Charlie Hebdo in the country's second city of Zinder left four dead and 45 injured.
On Friday, the protesters set fire to the French cultural centre and three churches in Zinder.
In his first reaction to the protests, President Francois Hollande stressed that France would continue to defend "freedom of expression."
Asked about protesters who burned the French flag, Hollande said: "They have to be punished because when it happens in France, it's intolerable, but also abroad."
"I'm thinking of countries where sometimes they don't understand what freedom of expression is because they have been deprived of it. But also, we have supported these countries in their fight against terrorism," said Hollande as he toured a market in his heartland of Tulle, central France.
Said Kouachi, one of the jihadist brothers who gunned down 12 people at Charlie Hebdo's offices before being cut down by security forces in a siege, has already been buried in secret, it emerged on Saturday.
He was buried Friday in the eastern city of Reims, where he lived for around two years, under heavy police protection and with a handful of family members present, according to a well-informed source.
His grave was unmarked and the name of the cemetery not divulged. His brother Cherif was expected to be buried soon in the Paris suburb of Gennevilliers.
The mayor of Reims, Arnaud Robinet, said he was forced by law to accept the burial but was initially opposed to the gunman being buried in his city.
He feared "a tomb that could become a shrine for people to gather around or a pilgrimage site for fanatics."
Said Kouachi's wife decided not to attend the burial, in order to keep it secret, said her lawyer Antoine Flasaquier.
"She is now relieved that her husband has been buried with discretion and dignity," said the lawyer.
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