The November 13 bomb attack in Istanbul’s busy Istiklal Avenue left six people dead, including two children. More than 80 others were wounded.

Turkish authorities blamed the attack on the outlawed Kurdistan Workers’ Party, or PKK, as well as Syrian Kurdish groups affiliated with it. The Kurdish militants have denied involvement.

At least 17 suspects have been jailed pending trial in connection with the attack, including Albashir who is accused of leaving the TNT-laden bomb on Istiklal Avenue. Officials said at the time that the attack’s planner had fled Turkey for Syria.

The PKK has fought an armed insurgency in Turkey since 1984. The conflict has killed tens of thousands of people since then.

Turkey has launched three major incursions inside Syria targeting Syria’s main Kurdish militia since 2016 and controls an area of Syrian territory along their joint border.