The suspected mastermind of the Paris attacks has been named as Belgian Abdelhamid Abaaoud by French officials.
It has been reported that Abaaoud had links to thwarted attacks on a Paris-bound high-speed train when two US soldiers overpowered a heavily-armed gunman and a separate attack on a church.
He also had links to two suspects killed in a counter-terrorism raid in Verviers, Belgium in January.
Abaaoud, who also uses the name Abu Omar al Baljiki, is of Moroccan origin and is believed to be in Syria currently.
Seven people are in custody in Belgium suspected of links to the attacks and an international arrest warrant has been issued for a Belgian-born Frenchman who is still at large.
Investigators have also named another suspect who was questioned and released by police hours after the massacres which left 129 people dead.
Salah Abdeslam, who has become known as "Public Enemy Number One", reportedly helped with logistics and rented a black Volkswagen Polo used by the gunmen who stormed the Bataclan concert hall and killed at least 89 people on Friday night.
The 26-year-old was apparently spoken to by officers on Saturday morning when they pulled over a car carrying three people near the Belgian border.
Police then checked Abdeslam's ID and subsequently let him go, officials told the Associated Press.
Abdeslam, who was born in Brussels, is described as 5ft 8in" tall and has brown eyes.
Meanwhile more suicide bombers involved in attacks have been identified by the prosecutor's office.
Ibrahim Abdeslam
The brother of Salah was reportedly among the seven suicide bombers in the co-ordinated assaults targeting six sites across the French capital.
A third brother was apparently arrested in Belgium and questioned before being released.
Samy Amimour
The 28-year-old, charged in a terrorism investigation in 2012, blew himself up inside the Bataclan theatre.
Prosecutors said he was from Drancy in northeast Paris and had been placed under judicial supervision but dropped off the radar and was the subject of an international arrest warrant.
Three people in Amimour's family have been in custody since early on Monday.
Ahmad al Mohammad
A suicide bomber who died outside the national football stadium was found with a Syrian passport with the name of this 25-year-old born in Idlib.
The identity of the man in the passport has not been verified but the prosecutor's office said fingerprints from the attacker match those of someone who passed through Greece in October.
Bilal Hadfi
He also lived in Belgium, said The Washington Post.
Ismael Omar Mostefai
A 29-year-old man from Courcouronnes, a town 16 miles south of Paris in Essonne, has been officially identified as another assailant.
He was one of the terrorists inside the Bataclan and had been flagged for links to Islamic radicalism. His father and brother have been arrested.
French newspaper Le Monde said he was identified from a print from his severed finger, discovered after he detonated a suicide vest inside the Bataclan.
He had a criminal record and was known to security services but had not spent time in jail or been linked to any extremist groups.
