In show of solidarity described as “unprecedented” by officials, 1.5 million people marched in the streets of Paris Sunday following a series of terror attacks that have shocked France and the world. Follow events as they unfolded on our liveblog.

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Massive crowds gathered in Paris for a unity march following this week’s three-day spree of violence, which killed 17 people.

More than 50 world leaders and top envoys joined French President François Hollande at the demonstration through central Paris.

The French Interior Ministry says an “unprecedented” number of people have marched but that an official count is “impossible”.

AFP estimates more than 2.5 million people rallied against terrorism across France on Sunday.

There have also been huge demonstrations in other French cities and towns, as well as European capitals such as London, Berlin and Vienna.

Interior Minister Bernard Cazeneuve met with European security ministers as well as US Attorney General Eric Holder earlier Sunday.

The demonstrations come two days after French security officials ended a siege in Dammartin-en-Goële, a town northeast of Paris, and a kosher supermarket at Porte de Vincennes, in eastern Paris.

A video posted online Sunday shows a man who appears to be the third Paris gunman, Amédy Coulibaly, pledging allegiance to the Islamic State group.

The Charlie Hebdo attackers Chérif and Saïd Kouachi claimed that al Qaeda’s Yemen branch sponsored and financed the attack.

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Live Blog FRANCE 24's liveblog on mass unity march in Paris

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