Holder of Syrian passport near Paris gunman crossed Greece

However, the Syrian passport found at the site of the attack might be fake, a U.S. intelligence official told CBS News, pointing out that it did not contain the correct numbers for a legitimate Syrian document and the picture did not match the name.

Belgian police, meanwhile arrested several suspects in Brussels on Saturday during raids connected to the Paris attacks, including one who was in the French capital at the time of the carnage, Prime Minister Charles Michel said.

In total, 129 were killed in the attacks, while 352 were injured – 99 of them seriously. A Syrian passport has been found near the body of one of assailants.

At least one of the suspects, believed to have blown himself up inside the Bataclan, was a 30-year-old Frenchman, flagged as an extremist in 2010, and known to intelligence services.

“The holder of the passport passed through the island of Leros on October 3, 2015, where he was identified according to European Union rules”, said Toscas.

The source close to the inquiry said that the gunman’s body had been identified by his fingerprints and that he was from the Courcouronnes suburb south of Paris.

The concert hall is just a few hundred metres from the former offices of the satirical weekly Charlie Hebdo, target of a deadly attack in January. On Saturday authorities said that they had found a sheet of paper and Global Positioning System location of an address in France, as well as eight automatic machine guns, three firearms and 200 g of explosive substances. It is also where a drone strike on Friday reportedly killed Jihadi John.

Syrian President Bashar al-Assad said that France and other Western nations were at least partly responsible for the attacks, criticising Holland for turning a blind eye to its allies which supported anti-regime groups in Syria.

If one or more of the attackers turn out to have come into Europe among the migrants arriving from war-torn countries, this could change the political and security debate about refugees and what to do with them.

An anti-Isil activist living in Deir Ezzor, a town partly held by Isil between Raqqa and the Iraqi border, told The Sunday Telegraph that earlier this year he overheard foreign fighters plotting a “huge” terror attack in Paris from an internet cafe. The 51-year-old Montenegrin citizen claimed he wanted to go to France to visit the Eiffel Tower.

“There is a connection to France but it’s not certain that there is a link to this attack”, said Thomas de Maiziere, Germany’s interior minister, as cited by AP.