French authorities yesterday 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.
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.
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.
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"We confirm that the (Syrian) passport holder came through the Greek island of Leros on October 3, where he was registered under EU rules," said the Greek minister for citizen protection, Nikos Toskas.
US President Barack Obama described the onslaught as "an attack on all of humanity" and an emotional Pope Francis said he was "shaken" by the "inhuman" attacks.
British Prime Minister David Cameron said the attacks "suggest a new degree of planning and coordination and a greater ambition for mass casualty attacks".
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.