Terrorists attacked multiple sites in Paris on Friday night.

Dozens of people were killed at a string of popular cafes and restaurants, as well as a concert hall - the Bataclan - where people taken hostage were killed by three attackers who detonated explosive belts.

Police are still hunting potential accomplices to eight attackers who were killed as at least six sites were attacked in rapid succession.

Islamic State has claimed responsibility for the attacks in an online statement.

French president Francois Hollande denounced the terror attacks as an "act of war".