Austria has said it will close down seven mosques and expel imams who it says are funded by foreign countries.
Chancellor Sebastian Kurz said the move was a crackdown on political Islam.
Some mosques are suspected of having links to Turkish nationalists. In April images emerged showing children in Turkish army uniforms re-enacting World War One’s Battle of Gallipoli.
The Turkish president’s office called Austria’s move “Islamophobic, racist and discriminatory”.
Presidential spokesman Ibrahim Kalin took to Twitter to condemn the move.