A Syrian passport found by police at the scene of the mass shooting in a Paris concert hall belonged to an asylum seeker who registered on a Greek island in October, a Greek minister said Saturday.

"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 a statement issued by Nikos Toskas, the minister for citizen protection.

It has not been confirmed that the passport belonged to one of the attackers, but French police are investigating.