German-Turkish relations have deteriorated since the failed coup against Turkish President Erdogan in 2016 and the crackdown on the opposition that followed.
Turkish police reportedly arrested a German national in August for defaming President Recep Tayyip Erdogan on social media in 2014 and 2015, Der Spiegel wrote.
According to the weekly news magazine, Huseyin M., a German citizen of Turkish descent who lives in Brunswick, Germany, was detained while on a holiday near the city of Izmir in western Turkey.
He was taken to a police station and told that he had twice insulted Erdogan on his Facebook page calling him a “dictator” and a “child murderer.”
Huseyin M. has denied the accusations.