France this week solemnly marks the anniversary of the Islamist assault on the Paris offices of the satirical weekly Charlie Hebdo, the first of two such deadly attacks which bookended a bloody 2015 of unprecedented violence in the French capital.

Subdued ceremonies are to take place under heavy security to mark the attacks on the weekly and a kosher supermarket in which three gunmen killed 17 people – an event which proved to be a grim forerunner of the suicide bombings and shootings 10 months later in which 130 people were killed.

Charlie Hebdo, known for satirical covers lampooning Islam and other religions as well as politicians, lost many of its top editorial staff in the January 7 attacks when Islamist militants opened fire on journalists inside the newsroom. The three gunmen were themselves shot dead by security police during three days of violence which ended with a hostage-taking at a Jewish deli in which four hostages were also killed.

Charlie Hebdo, known for satirical covers lampooning Islam and other religions as well as politicians, lost many of its top editorial staff in the January 7 attacks

The terror attacks prompted a worldwide solidarity movement, with the Je suis Charlie slogan going viral on social media.

In the second deadlier string of attacks on November 13, Islamist militants mowed down people in Paris cafés and a concert hall, and attacked a stadium in the nation’s worst post-war atrocity.

With the country on high alert since then and right through the New Year holiday season, soldiers will be out in force protecting official buildings and religious sites for the Charlie anniversary.

A man holding a pen and wearing a sticker reading Je suis Charlie during a march in Brussels in January 2015. Photo: François Lenoir/ReutersA man holding a pen and wearing a sticker reading Je suis Charlie during a march in Brussels in January 2015. Photo: François Lenoir/Reuters

Commemorative plaques will be unveiled today at the various sites of the January attacks, including at the weekly’s former offices, in modest ceremonies attended by families and government officials, a City of Paris spokesman said.

On Sunday, another, more public, ceremony will take place on the Place de la Republique, the square in eastern Paris which attracted mass rallies in favour of free speech and democratic values after the attacks and became an informal memorial.

President François Hollande will preside over the ceremony, during which a 10-metre-high commemorative oaktree will be planted, the Paris official said.

French rock giant Johnny Hallyday will perform a song called A Sunday in January, paying tribute to the millions of people who marched on the streets of French cities on the Sunday following the January attacks.

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