Police in Turkey arrested economics professor Mehmet Altan on Thursday amid an ongoing crackdown since July's failed military coup, local media reported.
Altan faces several charges, including an “attempt to overthrow the government of Republic of Turkey and prevent its function, and being a member of a terrorist organisation,” state-run news agency Anadolou said on Thursday.
Turkish and international groups have called for Altan's release.
Altan's brother, the prominent Turkish journalist Ahmet Altan was freed on Thursday under 'judicial control', according to the local press reports.
Speaking after his release, Ahmet Altan warned that Turkey faced a "terrible future" if the political leadership does not change.
The Altan brothers were detained for questioning on 10 September, accused of sending "subliminal messages" suggesting a military coup when they appeared on a TV show on the Can Erzincan channel a day before the failed 15 July putsch.
Writers, musicians and artists from around the world, including three Nobel laureates have urged Turkey to release the Altans. The list includes Orhan Pamuk, Margaret Atwood, Nick Cave, Neil Gaiman, Nick Hornby and Salman Rushdie.
The Can Erzincan channel has now been shut down along with dozens of other media outlets deemed to be associated Fethullah Gulen, the US-based cleric who Turkey accuses of orchestrating the attempted coup, which was swiftly crushed by Turkey.
A total of 260 people were killed in the failed coup bid and more than 100 left-wing journalists have since been arrested, along with tens of thousands of police, soldiers, judges and civil servants amid a widening probe of Gulen and his alleged supporters.
Gulen, who lives in self-imposed exile in the US, had built up a substantial media presence in Turkey. Most of his outlets have been closed since the abortive coup. He denies all of Turkey's accusations.
Government critics say the crackdown by Turkish authorities since the failed coup has spread beyond the perpetrators and has targeted rivals of Islamist-leaning president Recep Erdogan and his inner circle.
