Turkey summoned ambassadors of the five permanent member countries of the UN Security Council as well as German, Dutch ambassadors and EU's Turkey delegation head on Thursday, Turkish local media reported, following the bloody bombing in Ankara.
Prime Minister Ahmet Davutoglu had earlier said evidence regarding Wednesday's attack would be shared with the five countries.
According to Turkish Foreign Ministry sources, Turkish FM undersecretary Feridun Siniroglu will meet each ambassador separately for 30 minutes.
The latest terror attack has reportedly targeted military vehicles carrying personnel working for the Turkish Armed Forces (TAF) in the heart of the capital, killing at least 28 people and wounding 81 according to Turkish government.
President Recep Tayyip Erdogan has said that interior minister's first findings indicate that terrorist PKK's Syrian affiliate PYD is responsible for the Ankara attack despite the group's denial.
Turkey considers the PYD as the Syrian affiliate of the PKK. Turkey has long been confronted with armed attacks in its southeastern and eastern regions by the PKK, which is recognised as a terrorist organisation by Turkey, the US, and the EU.