Two people have been arrested at a refugee center in the Austrian city of Salzburg believed to be part of the ISIS terrorist cell responsible for last month’s Paris attack.

“Two people who arrived from the Middle East were arrested at the weekend in accommodation for refugees on suspicion of belonging to a terrorist organization,” Robert Holzleitner, a spokesman for the Salzburg prosecutor’s office, said.

“As part of the preliminary investigation, evidence suggesting a connection with the Paris attacks is being verified,” he added declining to comment comment on their nationalities, only saying that they had “come from the Middle East.”

Local newspaper Salzburger Nachrichten reported the men were found based on information provided by a foreign intelligence service.

Newspaper Kronen Zeitung said they were French, of Algerian and Pakistani origin, and entered Europe through Greece using fake Syrian passports.