Paris attacks: a man breaks down  at a site of the attacks

French police have identified three teams of gunmen wearing suicide vests who killed at least 129 people in Paris’s worst ever attacks that were claimed by the Islamic State group and prompted a global outpouring of solidarity with the victims.

The discovery of a Syrian passport near the body of one attacker has raised suspicions some of them might have entered Europe as part of an influx of people fleeing Syria’s civil war.

“We confirm that the (Syrian) passport holder came through the Greek island of Leros on October 3 where he was registered under EU rules,” said the Greek minister for citizen protection, Nikos Toskas.

A total of 129 people were killed and 352 wounded, of whom 99 were said to be in critical condition. The toll does not include the attackers.

The remains of the 29-year-old French gunman were found near the Bataclan concert hall in eastern Paris, the site of the bloodiest attack.

Police have since taken into custody the father and brother of the gunman and were searching their homes, a source close to the probe told AFP.

Paris attacks: an injured victim being escorted by police

A total of 89 people were killed at the Bataclan by the armed men who burst in shouting “Allahu akbar” (God is greatest) before gunning down concert-goers and executing hostages.

The jihadists were heard raging at the French president and his decision in September to begin air strikes on Islamic State targets in Syria.

In a statement posted online Saturday, IS claimed responsibility for the attacks and referred to French air strikes on IS in Syria.

The group, which has sown mayhem in large swathes of Syria and Iraq, threatened further attacks in France “as long as it continues its Crusader campaign.”

The band on the Bataclan’s stage during the attack, US rock group Eagles of Death Metal, survived but have cut short their European tour to return to the United States, promoters said.

As police stormed the venue, two of the gunmen blew themselves up, while the third was shot by police.

Three suicide bombers also detonated their explosives outside the Stade de France stadium where France were playing Germany in a football friendly attended by Hollande, who was evacuated.

The seventh attacker blew himself up on a bustling avenue near the concert hall, injuring one other person.

The explosions marked the first-ever suicide bombings on French soil.

Belgian police Analysts at Eurasia Group said the attacks “confirm a structural shift in the modus operandi of the Islamic State, and represent a prelude to additional attacks in the West.”

– European investigation –

The investigation spread beyond France on Saturday as Belgian police arrested several suspects in Brussels, including one who was in Paris at the time of the carnage.

The arrests — local media said three people were detained — were in connection with a vehicle found near the Bataclan concert hall, they said.

In Germany, the authorities said they were looking into a possible link between the attacks and the arrest in Bavaria last week of a man with a car-load of weapons and explosives.

The Paris attacks were “prepared, organised and planned overseas, with help from inside (France),” Hollande said.

In Greece — the main entry point into Europe for hundreds of thousands of migrants fleeing conflict and misery — police were investigating a possible Syrian connection to the Paris attacks, though they did not rule out that the Syrian passport may have changed hands before the assault.

As well as the stadium and the concert hall, several restaurants were also targeted in Friday’s violence, including a popular Cambodian eatery in the trendy Canal St. Martin area, where at least 12 people died.

Another 19 people were killed at a busy restaurant on nearby Rue de Charonne.