One of the suicide bombers in the Paris attack had featured in a previous terrorism investigation but slipped through the net, it has emerged.
Prosecutors identified one of the assailants who blew himself up in the Bataclan music hall on Friday as Samy Amimour, a 28-year-old Frenchman.
In a disclosure that will deepen concerns over possible intelligence failures, officials revealed that Amimour had been charged in a terror probe in 2012 over claims he planned to travel to Yemen.
He was placed under judicial supervision but dropped off the radar - prompting authorities to issue an international arrest warrant.
It was also revealed that a suicide bomber who blew himself up outside the national soccer stadium was found with a Syrian passport in the name of Ahmad Al Mohammad, a 25-year-old born in Idlib.
His fingerprints matched those of someone who passed through Greece in October.