An estimated 3 million people have marched on Paris.
French President Francois Hollande comforts a Charlie Hebdo columnist.
Pens and pencils have become a sign of strength following the shooting of 12 journalists.
Demonstrators make their way along Boulevrd Voltaire in central Paris.
French people have banded together in light of the atrocities.
Large crowds chanted, cheered and clapped, flooding the streets of Paris.
World leaders walk arm-in-arm at the start of the march.
World leaders including French President Francois Hollande, German Chancellor Angela Merkel and Palestinian president Mahmud Abbas lead the march.
Seventeen people were killed in three separate attacks in Paris.
People gather at Place de la Nation holding a sign saying "solidarity" following the unity rally.
The slogan of the campaign "we are Charlie" was carried by supporters.
Millions converged on Paris for the unity rally following shootings in Paris last week.
"Kill = 17, wounded = 66 million French people.
We are standing without fear! Because we are Charlie."
The Rector of Paris' Great Mosque Dalil Boubakeur (front) and Samuel Sandler, father and grandfather of three of the victims of Islamist gunman Mohamed Merah.
People gather at the march in Paris.
"I am Charlie."
"I am the military who have fallen or been wounded in the fight against Islamic terrorism."