Attacker in Paris concert hall shouted 'Allahu akbar', fired into crowd: witness

Rescuers workers evacuate victims near the Bataclan concert hall in central Paris, on November 13, 2015 (AFP Photo/Dominique Faget)

Paris (AFP) - One of the attackers at a Paris concert hall where at least 15 people were killed Friday fired into the crowd shouting "Allahu akbar" (God is greatest), a witness said.

France has declared a state of emergency after at least 39 people have been killed in attacks across seven locations across the capital.