Prosecutors believe the men were sent by I-S to Germany late last year to either carry out a mission or to wait for further instructions.
They are suspected of having links to the perpetrators of November's Paris attacks.
German police arrest alleged IS slepper cell
Một nghi can khủng bố, thứ hai bên phải Source: AAP
German police say they have arrested three Syrian nationals suspected of being members of the militant group Islamic State (IS).
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