Seven suicide attackers are believed to have killed 132 people in six co-ordinated terror attacks across Paris on Friday.
A number of different locations were targeted - including a concert venue, cafes and restaurants and the country's national football stadium.
Here's what we know:
It is believed there were three teams of attackers.
All are believed to have worn identical explosive belts.
One of the men thought to be involved in the attacks is now on the run. He has been named as Abdeslam Salah, 26, and was born in Belgium.
There is an international warrant for his arrest.
The following names for the suicide bombers have been released:
Omar Ismail Mostefai: Paris-born, 29-year-old Mostefai lived in Courcouronne. Before that, he lived in Chartres, where he worshipped at the Luce mosque, and had been flagged for links to Islamic radicalism. He was the first suicide attacker named by French authorities, identified by prints taken from a severed finger, and struck at the Bataclan. His father and brother and four other family members have been arrested as part of the investigation.
Samy Amimour: Aged 28, Amimour is the second suicide bomber to be named from the Bataclan theatre. He was born in Drancy, a north-eastern suburb of Paris. He was known to French authorities before the attack, having been previously charged in a terrorism investigation and was the subject of an international arrest warrant. Prosecutors say three people in Amimour’s family have been in custody since early Monday.
Ahmad Al-Mohammad (also spelt Ahmed Almohamed): A Syrian passport-holder said to have travelled to France via Greece and Serbia. He has been named as one of the suicide bombers outside the France vs Germany match at the Stade de France. He was born in Idlib, Syria, according to the passport, which French police said matched the bomber’s fingerprints.
Bilal Hadfi: The second suicide bomber near the Stade de France, according to Belgian media and the Washington Post. The 20-year-old's nationality is unknown, but he is believed to have fought in Syria over the past year. He is said to have been living in Belgium at the time of the attacks.
Ibrahim Abdeslam or Brahim Abdeslam: Aged 31, he carried out the suicide attack at the Comptoir Voltaire cafe. According to French prosecutors, he was a French national based in Belgium and was the one who rented the Seat car.
Meanwhile, Belgian extremist Abdelhamid Abaaoud has been named by French officials as the mastermind of the suicide bombings and shootings. He is understood to be in Syria.
Also known as Abu Umar Al-Baljiki, he has previously appeared in Islamic State propaganda.
Police have been carrying out a series of searches focused on the Molenbeek district of Brussels, where one of the men was living.
There have also been seven arrests in Brussels linked to the attacks.
A black Seat car, believed to be linked to the attacks has been found by police in Montreuil, about 4 miles east of the French capital.
Several Kalashnikov rifles were found in the abandoned car
It appears to suggest that at least one attacker remains on the run.
The concert hall attackers spoke of Syria and Iraq.
Islamic State has claimed responsibility for Friday night's coordinated terror attacks on Paris in an official statement seen by Reuters news agency.
A 51-year-old man arrested in the German state of Bavaria last week after guns and explosives were found in his car has been linked to the attacks. He had a Paris address programmed into his car's sat nav.