Cafer Türker Hadimioğlu, a math teacher with a 60 percent disability rating, has been put in pre-trial detention over his alleged links to Turkey’s Gulen group, which the Turkish government accuses of masterminding a coup attempt in 2016.

The group denies any involvement.

According to the Bold news portal, 44-year-old man has been placed in a solitary confinement at the Ereğli prison in Konya province. He was sentenced to 1 year and 13 months in prison for having a checking account at the now-closed Islamic lender Bank Asya.

In the aftermath of the coup attempt, the Turkish government closed down Bank Asya on the grounds that it was linked to the Gülen group. Before the government seizure Bank Asya was one of three banks with the highest liquidity in Turkey. The government took over the bank on Feb. 4, 2015, contrary to strict statutory banking regulations against such a drastic move.

The bank, which had 210 branches, 5,000 employees and around 1.5 million clients, was founded on Oct. 24, 1996 upon formal approval from regulators. It operated under the supervision of independent regulatory bodies in Turkey that were responsible for overseeing the banking sector. It was a popular bank.

In the wake of the coup attempt in July 2016 having an account at Bank Asya was presented by prosecutors as evidence of membership in a so-called “terrorist organization.”