A Turkish Foreign Ministry official say the ambassadors of the five permanent U.N. Security Council member states have been invited to the ministry separately and are being briefed on the attack in Ankara which killed 28 people.
The five permanent members are Britain, China, France, Russia and the U.S.
The ambassadors of Germany and the Netherlands as well as the head of the European Union delegation were also invited on Thursday, the ministry official said. The official spoke on condition of anonymity because she wasn't authorized to speak publicly on the issue.
Turkey's leaders say a Syrian national who was a member of Syrian Kurdish militia group carried out the suicide car bombing on Wednesday evening in collaboration with Turkey's own Kurdish rebel group, the Kurdistan Workers' Party, or PKK.
Turkey labels both groups as terrorist organizations and is pressuring allies to stop backing the Syrian Kurdish militia group. The Syrian Kurdish militia, however, are a key force in the fight against the Islamic State group.