Zarif made the remarks while speaking to reporters upon arrival at Ankara Esenboğa Airport.
'All people and the armed forces are ready to confront the threat of terrorism,' Zarif said.
The Iranian foreign minister, meantime, extended condolences to the bereaved families of the victims and condemned the terrorist attack in Iran, adding that terrorism is a global challenge.
'Terrorism is a problem which we are facing in the Middle East and other parts of the world,' foreign minister added.
Zarif referred to unfavorable security conditions in the region and called for all-out cooperation in this regard.
The whole region is insecure, Zarif said.
He added that he will discuss regional developments, including the Syrian crisis with Turkish President Recep Tayyip Erdoğan and his Turkish counterpart Mevlüt Çavuşoğlu.
Zarif arrived in Ankara on Wednesday to discuss latest regional and international developments as well as bilateral ties with Turkish officials.
In an apparently coordinated attempt, two terrorist groups attacked mausoleum of the late Imam Khomeini, southern Tehran, and the Iranian Parliament (Majlis) on Wednesday morning, killing 12 people and injuring 42 more.
One of the terrorist was gunned down by the security forces and another attacker, reportedly a woman, blew herself up outside the Imam Khomeini shrine.
The terrorist group of Daesh (the ISIS terrorist group) has claimed responsibility for the fatal attacks in Tehran.
Terrorists entered the Parliament building while they had dressed as women, said a security official.
Parliament operation ended by security forces who killed three of the terrorists, one of them had detonated himself before.
Meanwhile, according to an official at the Intelligence Ministry, several terrorist cells have entered Tehran to carry out terrorist operations but members of one of the cells have been arrested.
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