Ahmet Turk, 74, former mayor of the city of Mardin in southeast Turkey, was ordered released after supporters expressed concern over his health, his lawyer Zeynep Ceren Boztoprak told AFP.

Dozens of pro-Kurdish mayors including Turk, have been detained under the state of emergency after the July 15 failed coup that sought to unseat President Recep Tayyip Erdogan.

Boztoprak told AFP that Turk was currently being held in the southeastern city of Elazig and would be released later in the evening.

However, the mayor would be still subjected to judicial control measures and a ban on leaving Turkey, according to the lawyer.

Opposition MP from the secular Republican People's Party (CHP) Sezgin Tanrikulu lauded the court verdict.

"This false decision against justice and conscience has finally been reversed," he wrote on Twitter.

Turk was ousted from his office and arrested in November last year.

Because of his deteriorating health in prison, Turk had appealed to await his trial outside of prison and was taken to Istanbul to receive a health report.

But the Istanbul medical authorities turned down the request.

Television images showing him taken to hospital in Elazig in handcuffs and escorted by gendarmerie officers sparked outrage among politicians including from the ruling Justice and Development Party (AKP).

AKP MP Garip Ensarioglu expressed dismay over the "disturbing" images, saying that Turk should have been treated to protect his dignity.

"The way Ahmet Turk was treated was not appropriate," he said, quoted in Turkish media.

"People should be treated according to their age and position. Handcuffs are placed on people as a precaution against the possibility of fleeing," he said.

The veteran politician played key role in now collapsed talks between Kurdish militants and the Turkish state aiming to end an over three decade conflict that has left tens of thousands dead.

Critics complain the authorities are using the state of emergency imposed following the July 15 coup attempt to crack down on all opposition, ahead ahead of a vote on changing the constitution expanding Erdogan's powers.

Turkey on Tuesday arrested two more MPs from the main pro-Kurdish Peoples' Democratic Party (HDP), including its chief spokesman Ayhan Bilgen, raising the number of HDP MPs behind bars to 12, including the party's co-chairs Selahattin Demirtas and Figen Yuksekdag.