See the face of one of Paris killers.

This is the face of one of the Paris killers who was one of at least two behind the carnage who are thought to have sneaked into France by posing as refugees.

Serbian media claims one of the terrorists was Ahmed Almuhamed, 25, who was carrying a Syrian passport, blew himself up at the Bataclan concert hall, where at least 80 people were slaughtered on Friday. 

One of the attackers was last night named locally as homegrown terrorist and French national Omar Ismaël Mostefai , 29, from the Courcouronnes suburb of Paris.

The newspaper, Blic, Almuhamed arrived with another of the bombers in Europe on the Greek island of Leros on October 3 on his way to Paris. Police said the two men, who arrived in Greece last month, were among seven attackers, one as young as 15.  

The disclosure, which came amid claims of French intelligence failures, inevitably raised new security concerns about Europe's borders.