Two more German citizens have been arrested in Turkey "for political reasons", Berlin said Friday, bringing the total number of German political prisoners in Turkish custody to 12.

"On August 31, two German nationals were detained in Turkey for political reasons," foreign ministry spokeswoman Maria Adebahr said, adding that news of the arrests was confirmed not by Ankara but by Anatolia airport police.

The German authorities have yet to be allowed to see the pair, she added, declining to give further details.