Huge crowds and some 40 world leaders have gathered in Paris for a unity march after 17 people were killed during three days of deadly attacks.
More than a million marchers are expected to take the streets.
Police are seeking accomplices of the gunmen who attacked satirical magazine Charlie Hebdo and a kosher supermarket.
Ahead of the rally, a video emerged appearing to show supermarket gunman Amedy Coulibaly pledging allegiance to militant group Islamic State.
In the video, he said he was working with the Charlie Hebdo attackers: “We have split our team into two… to increase the impact of our actions.”
Said and Cherif Kouachi – who were shot dead by police on Friday – killed 11 people at the magazine offices in the French capital on Wednesday, and a policeman in a nearby street.
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