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More than three million people have taken part in unity marches across France after 17 people died during three days of deadly attacks in Paris, the BBC reported.

Up to 1.6m are estimated to have taken to the streets of the French capital.

More than 40 world leaders joined the start of the Paris march, linking arms in an act of solidarity.

The marchers wanted to demonstrate unity after the attacks on satirical magazine Charlie Hebdo, police officers, and a kosher supermarket.

The French government said the rally turnout was the highest on record.

The rally, led by relatives of the victims of last week's attacks, began at the Place de la Republique and concluded in the Place de la Nation.

Several other French cities also held rallies. The interior ministry said turnout across France was at least 3.7 million, including up to 1.6 million in Paris - where sheer numbers made an exact tally difficult.

Rallies also took place outside of France, with thousands of people gathering in London, Washington, Montreal and Berlin.

In Madrid, several hundred Muslims held banners saying "Not in our name" next to the train station where in 2004 Islamist bombings killed nearly 200 people.