Three other suspects were released from detention pending trial by the court, according to Anadolu Agency. Additionally, 29 individuals who were detained by police in connection with the attack were ordered to be deported from Turkey.
Six people, including two children, were killed in the explosion on November 13 that targeted Istanbul's busy Istiklal Avenue, a well-known thoroughfare lined with shops and restaurants. Over 80 other people suffered injuries.
The bombings that struck Turkish cities between 2015 and 2017 were shockingly brought to mind by the incident, shattering the populace's sense of security.The banned Kurdistan Workers' Party, or PKK, as well as other Syrian Kurdish factions were held responsible by Turkish authorities for the explosion that occurred last weekend. The militant Kurdish organisations have denied involvement.
Five hours were spent questioning the primary suspect in the attack, a Syrian woman who is accused of setting off a bomb containing TNT on Istiklal Avenue.
Ahlam Albashir, a lady, allegedly admitted to her interrogators that she had entered Turkey illegally and had resided in an Istanbul home for four months while posing as a couple with one of the other suspects, according to the Anadolu Agency.
Albashir allegedly acknowledged dropping a bag holding the explosive device on a street bench but insisted she had no idea what was inside, according to the news agency.
Prosecutors are likely to compile their indictment, which could take months, before setting a trial date.
In the Syrian city of Azaz, which is currently governed by the Syrian opposition that Turkey supports, one suspect was captured by Turkish police late on Wednesday and was being questioned by officers.
Regarding the 29 people who could be deported, nothing was known.
Since 1984, the PKK has waged an armed insurgency against Turkey. Since then, tens of thousands of people have died in the fight.