French authorities today named the first attacker as 29-year-old Omar Ismail Mostefai, who was identified from a severed finger found at Bataclan concert hall, scene of the worst of the bloodshed.

Six people close to Omar Ismail Mostefai, who took part in the killings at the Bataclan concert hall and the first of Friday's attackers to be identified, have been detained, including his father, brother and sister-in-law, judicial and police sources said.

IS jihadists said they were behind the gun and suicide attacks that left a trail of destruction at a sold-out concert hall, at restaurants and bars, and outside France's Stade de France national stadium.

Photo Gallery: Paris in grief over deadly terror attacks

President Francois Hollande called the coordinated assault on Friday night an "act of war" as the capital's normally bustling streets fell eerily quiet, 10 months after attacks on magazine Charlie Hebdo shocked the nation.

Meanwhile the investigation widened across Europe, with Belgian police arresting several suspects and German authorities probing a possible link to a man recently found with a car of explosives. The discovery of a Syrian passport near the body of one attacker has raised suspicions some of the assailants might have entered Europe as part of an influx of people fleeing Syria's civil war.

The attacks, which killed 129 people and wounded 352, including 99 critically, were the first ever suicide bombings on French soil. Unlike those in January, none of the assailants had ever been jailed for terror offences.

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