Turkish Foreign Minister Ali Babacan met Iranian President Mahmoud Ahmadinejad on Tuesday on the sidelines of the 15th Ministerial Conference of the Non-Aligned Movement in Tehran.
The meeting was originally scheduled for Wednesday.
Turkish foreign minister later met Iran's chief nuclear negotiator Saeed Jalili.
Ali Babacan met also on Tuesday his Iranian counterpart Manuchehr Motaki.
Speaking at the meeting, Motaki condemned the bomb attack in Istanbul and said he shared sorrows of Turkish state and people.
The Non-Aligned Movement is an international organization of states considering themselves not formally aligned with or against any major power bloc. It was founded in April 1955; as of 2007, it has 118 members. The purpose of the organization as stated in the Havana Declaration of 1979 is to ensure "the national independence, sovereignty, territorial integrity and security of non-aligned countries".
Representatives from 118 member-countries, 15 observer countries as well as 8 regional and international organizations are attending the conference.
Turkey attends the conference as observer.