French investigators believe they've identified a Belgian militant in Syria as a coordinator of the deadly Islamic State attack on Paris, but a year on they are still struggling to pinpoint the mastermind.
Just ahead of the November 13 anniversary of an assault that killed 130 people and injured hundreds, victims and relatives of the dead still seek answers.
And the only living person believed to be part of the hit-team, now behind bars, refuses to talk.
An investigation led by an exceptionally large team of six judicial magistrates has inched forward in search of the "remote-controllers" - those who pulled the strings from abroad, at IS bases in Iraq and Syria or elsewhere.
A source close to the investigation told Reuters this week that a new name had been added to the web of militants involved as coordinators - Oussama Atar, a 32-year-old from a Brussels suburb, now believed to be in Syria.
Atar is suspected of being the mastermind and having recruited two Iraqis who blew themselves up outside the Stade de France sports stadium north of the French capital.
He is also suspected of being the person to whom other suicide bombers reported before blowing themselves up in further attacks in Belgium that killed 32 on March 22 this year.
Bernard Bajolet, head of France's foreign intelligence service, told a parliamentary inquiry in May that the orchestrators of the attack had been identified but declined to name names to protect his sources.
Investigators, however, have yet to make such an identification, another source, speaking on condition of anonymity, told Reuters, and do not know who Bajolet was referring to.
At one stage, it was assumed that the mastermind of the attacks was Abdelhamid Abaaoud, a Belgo-Moroccan killed by elite French police in a spectacular assault on a flat close to Paris a few days after the killings.
He was subsequently relegated by investigators to a coordinator role like Atar's.
