Turkish authorities have arrested an Austrian journalist and activist on suspicion of a terrorism-related offence, the leftwing website where he works said on Tuesday, Reuters reported.

Re:volt, which describes itself as a “radical left-wing” online magazine, said Max Zirngast had been arrested at his apartment in the Turkish capital Ankara on Tuesday morning.

“We condemn this arrest in the strongest terms of course and call for his immediate release,” Re:volt said by email, confirming a statement on the arrest from rights group Reporters Without Borders.

“Our writer, who has lived in Turkey for many years, is a passionate leftist activist and author who campaigns for freedom and democracy,” the German-language publication added.