Hüsamettin Uğur, a former Supreme Court member who has been held in solitary confinement in Kırıkkale prison, has been given a prison sentence of 10 years, six months for alleged membership in Turkey’s Gülen group.

Uğur was among some 4,000 judges and prosecutors who were purged by a government decree after a failed coup in 2016 and was later arrested over alleged terrorism links.

Turkey accuses the Gülen group of orchestrating the abortive putsch, although it latter denies any involvement.

Uğur’s daughter, Nalan Dilara Uğur took to Twitter on Oct. 4 and claimed that her father has been held in a solitary confinement for three years and has been handed down a prison sentence despite the lack of any credible evidence.

“That prison [where Uğur stays] is not being inspected [by the stated]. My father’s demand for an inspection has been disregarded,” Uğur tweeted.,

Since the coup attempt, nearly 140,000 public servants have been purged by the government over alleged Gülen links, and more than half a million people have been the subject of terrorism investigations.