Greek police have arrested several people over alleged links to a suspected terror plot in Belgium.
One of the men is alleged to have been in contact with the cell in Verviers, Belgium, where a shootout with police left two suspects dead on Thursday.
Europe is on high alert after Islamist gunmen killed 17 people in Paris. More than 20 people have been arrested in Belgium, France and Germany.
Troops were deployed across Belgium on Saturday to guard potential targets.