Huge crowds and heavy security measures are expected in Paris for the Unity Rally after three days of terror have shaken the capital, and one accomplice is still on the run.

Around 40 world leaders are arriving to join the show of force which is expected to dwarf similar demos on Saturday with over a million people.

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Security measures

France remains on high alert as reports emerge that sleeper cells have been activated. More than 2000 police and 1000 security forces have been deployed along the march routes, including snipers who will be placed in position along the march routes starting in Place de la Republique and ending at Place de la Nation.

The march will be led by the families of the victims of the attacks. In all 17 people were killed in separate incidents which began with the attack on the French magazine Charlie Hebdo.