WeltN24, the German media group that publishes Die Welt daily newspaper, has lodged a complaint to the European Court of Human Rights (ECHR), over Turkey’s jailing of journalist Deniz Yücel.

The veteran Die Welt reporter was first detained as part of an investigation for publishing stories on the leaked emails of President Erdoğan’s son-in-law and Energy Minister Berat Albayrak in mid-February and he has been under arrest in a Turkish prison on accusations of spreading terrorist propaganda since then.

WeltN24 said in its complaint that Turkey violated Yücel’s freedom of expression. The jailing of Yücel makes reporting on location in Turkey impossible, the complaint read.

Turkey has jailed more than 274 journalists since last summer, becoming the world’s largest prison for journalists. While some 160 of them still remain behind bars, some others are being tried without arrest.