Eleven Germans are now held by Turkey for political reasons, including three who have been detained since the summer of 2016, according to the German foreign ministry.
"That means the nightmare of so many German nationals who wanted nothing else than to have a holiday in Turkey continues", he said.
Though Germany has not issued a formal travel warning, the Foreign Office maintains a travel alert on its website telling Germans to exercise caution when vacationing in Turkey. "A person doesn't think they're in danger, and suddenly they're in a Turkish prison", said Schaefer, not elaborating on the reasons for the detentions.
Before Monday's news of additional arrests, 10 Germans were in detention in Turkey, including German-Turkish journalist Deniz Yucel, who has been held for over 200 days.
"Turkey's travel warning against Germany is a bad joke!"
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Turkey's Foreign Ministry cited increased right-wing and racist rhetoric before Germany's September 24 election in the warning it circulated Saturday.
A German lawyer accused Chancellor Angela Merkel of misusing public funds in the election campaign, writes Spiegel.
EU Commissioner Guenther Oettinger, in separate remarks, rejected calls for breaking off discussions with Ankara about its accession to the European Union, saying such a move would only strengthen President Tayyip Erdogan, who is under fire from Brussels over his crackdown on opponents after a failed coup.
While Merkel's Christian Democratic-led bloc leads challenger Martin Schulz's Social Democrats by as many as 16 percentage points in polls, the small but steady protests underscore the well of discontent over her liberal refugee policy that's shifting Germany's political landscape, even as she seeks a fourth term as chancellor on a platform of stability.
"Baseless imprisonment for many Germans is unjust!"