A women has been nabbed over the explosion that rocked Central Instabul, Turkey on Sunday.
The blast killed six people and wounded 81 others at a busy shopping street.
Interior Minister Suleyman Soylu said the arrested suspect had sat somewhere close to where the blast took off and only stood up after the incident.
The Kurdistan Workers’ Party (PKK) is suspected to be behind the attack.
The PKK is the militant group calling for an independent Kurdish state within Turkey.
The EU and the US regard it as a terrorist organisation.
No one has so far claimed responsibility for the blast.