According to the Hurriyet newspaper, two individuals suspected of their implication in the crime were freed.
The court hearings were held behind closed doors and lasted more than 7 hours, the daily added.
The death toll in the twin suicide bomb blasts in the Turkish capital of Ankara has risen to 102, according to Ankara Public Prosecutor`s Office estimates.
Following the attack, Turkish Prime Minister Ahmet Davutoglu suggested the suspected suicide attacks outside a central train station during a pro-Kurdish peace rally might have been carried out by either the Kurdistan Workers’ Party (PKK) or the Islamic State jihadist group.
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