German officials summoned the Syrian ambassador to Berlin on Tuesday and protested at the surveillance of Syrian dissidents on German soil, Foreign Minister Guido Westerwelle said.
He spoke hours after German police had arrested two men in Berlin as part of an espionage inquiry, dpa reported.
The ambassador was summoned to the Foreign Ministry, where he was told that Germany would not tolerate the intimidation of dissidents on its soil. Westerwelle made no direct comment on a police inquiry into alleged infiltration of dissident groups.
The Syrian ambassador has repeatedly been summoned to hear German protests at the violent crackdown by President Bashar al-Assad's regime on demonstrators and opponents.