Murat Tuncer, a Turkish professor and the former rector of Hacettepe University, has been held in solitary confinement for over two years at Ankara’s E Type Sincan prison over alleged membership in the Gülen movement, which the Turkish government accuses of masterminding a coup attempt on July 15, 2016.

According to a twitter account, Tuncer has recently undergone a surgery and he was sent back to prison soon after the operation was carried out at an Akara Hospital.

The claim has neither been confirmed nor denied by the Turkish authorities.

Turkey survived a military coup attempt on July 15, 2016 that killed 249 people. Following the putsch, the Justice and Development Party (AKP) government along with President Recep Tayyip Erdoğan pinned the blame on the Gülen group, initiating a widespread purge aimed at cleansing members of the movement from within state institutions, dehumanizing its popular figures and putting them in custody.