The Turkish government says the fact they had released information about Paris attacker Ismail Mostefai to the French authorities back in December 2014 showed a need for better intelligence sharing.

"This is not a time to play the blame game," a government official said, "but we are compelled to share the information to shed light on Omar Ismail Mostefai's travel history."

"The case clearly establishes that intelligence sharing and effective communication are crucial to counter-terrorism efforts."

The Turkish government have released information about one of the suspected attackers, Omer Ismail Mostefai, who died at the Bataclan concert hall.

A senior official said Mostefai had entered Turkey in 2013 but that there was no record of him leaving the country.

Turkey received an information request regarding four terrorism suspects from the French authorities in October 2014, the official said. During the investigation, the Turkish authorities identified Mostefai as a fifth individual and notified their French counterparts twice - in December 2014 and June 2015. 

"We have, however, not heard back from France on the matter. It was only after the Paris attacks that the Turkish authorities received an information request about Omar Ismail Mostefai from France," the official added.

French Interior Minister Bernard Cazeneuve says 168 locations across France were raided by police overnight, and 23 individuals were detained and taken in for questioning. Thirty-one weapons, including a rocket launcher, were seized. 

A further 104 individuals have been placed under house arrest in the past 48 hours.

"It's just a start. These operations are going to continue. The response of the Republic will be huge, will be total," Mr Cazeneuve says. "The one who targets the Republic, the Republic will catch him, (it) will be implacable.'' 

There were large crowds observing the minute's silence on the streets of Paris

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

People fell silent in cities across Europe to remember the victims of Friday's attacks in Paris

Image source, Getty Images

Image source, Reuters

The jihadist group Islamic State (IS) claims there were no casualties as a result of the air strikes by the French military on its stronghold of Raqqa in Syria on Sunday. A statement says 30 strikes targeted "empty locations" around the city.

The French authorities said the air strikes destroyed an IS training camp and a munitions dump. The anti-IS activist group, Raqqa is Being Slaughtered Silently, said earlier that there were no reports of any casualties.

France will hold a nationwide minute of silence for those who died in the attack at midday local time (11:00 GMT)

The UK will also observe the silence.

Belgian police are refusing to comment on reports of fresh raids on addresses in the Molenbeek district of Brussels, where a number of those alleged to have been involved in Friday's attacks in Paris lived.

Belgian media say there is a large police presence on a street a few hundred metres from where arrests were made over the weekend. 

Some are also reporting that shots and explosions have been heard, but BBC teams in Brussels have been unable to confirm that.

Here's what we know so far about the suspected Paris attackers:

• Brahim Abdeslam, 31 - named as attacker who died near the Bataclan concert hall
• Omar Ismail Mostefai, 29, from near Paris - died in Bataclan attack
• Bilal Hadfi, 20 - named as attacker who died at Stade de France
• Samy Amimour, 28, from near Paris - suicide bomber at Bataclan
• Man with passport bearing the name of Ahmad Al Mohammad, 25, from Idlib, Syria - died at Stade de France

• Salah Abdeslam, 26, brother of Brahim Abdeslam - urgently sought by police
• Mohammed Abdeslam, brother of Brahim Abdeslam - reportedly arrested in Belgium

The Belgian newspaper De Standaard reported earlier that one of the suicide bombers in Paris had links to Abdelhamid Abaaoud, the suspected mastermind of Friday's attacks.

Brahim Abdeslam appeared in several police files alongside Abaaoud - a 27-year-old Belgian of Moroccan descent.

They were relating to criminal cases in 2010 and 2011. Both men also lived in the Brussels district of Molenbeek. 

"Investigators see a link with Verviers," De Standaard's report said, referring to a Belgian town where police shot dead two militants in January and broke up a cell aiming to kill Belgian police officers days after the Charlie Hebdo attacks in Paris. 

 Abaaoud is believed to have joined Islamic State (IS) in Syria.

The BBC's Hugh Schofield in Paris notes that the French authorities are not certain about the identity of one of the men who blew themselves up at the Stade de France on Friday. The dead man had a Syrian passport bearing the name Ahmad Al Mohammad, but it has not been established that the passport is genuine. 

What is official, our correspondent says, is the man came to Europe with migrants via the Greek island of Leros in early October. His fingerprints match those taken on arrival by the Greek authorities. 

It is a development which is bound to sharpen debate about the recent influx of migrants from Syria, our correspondent adds.

Image source, Blic.rs

People around the world have been holding memorials to honour the victims of the Paris attacks. 

Image source, Getty Images

Image source, Getty Images

Image source, Reuters

Image source, Reuters

The BBC's Jenny Hill in Berlin reports that the German police union is demanding support from the German army at the country's border with Austria. Following the Paris attacks, the union says they need to free up police officers for counter-terrorism work.

Belgian police have carried out a raid in the Molenbeek district of the capital, Brussels, state broadcaster RTBF reports. A large number of police searched a building in Rue Delaunoy, its website says, external.

A number of those alleged to have been involved in Friday's Paris attacks lived in Molenbeek. 

Earlier, Belgian Foreign Minister Didier Reynders said the authorities needed "to organise more and more actions" in the district, from where many European jihadists are believed to have travelled to fight in Syria and Iraq.

Image source, Reuters

Place de la Republique, a square in Paris, has become a focal point for those wishing to pay their respects to victims of Friday's attacks.

BBC News asked people there to sum up their thoughts in one word. Watch them here

UK Prime Minister David Cameron tells BBC Radio 4's Today programme that the Paris attacks "could happen here".

Listen to the interview with Nick Robinson here