Turkish President Recep Tayyip Erdogan has vowed to bring terrorism "to its knees" after an attack in the capital Ankara that killed at least 34 people.
Mr Erdogan said the suicide car bomb would serve only to strengthen the resolve of Turkey's security forces.
The explosion, in Guven Park in the Kizilay district, a key transport hub, wounded at least 125 people.
Interior Minister Efkan Ala said an investigation would conclude on Monday and those responsible would be named.
No group has claimed responsibility for the attack, but government sources are casting suspicion on the outlawed Kurdistan Workers Party (PKK).
The Kurdish rebels have carried out a series of attacks on Turkish soil in recent months. The so-called Islamic State group has also targeted Ankara recently.