Qalibaf made the remark on Monday while addressing the 17th Conference of the Parliamentary Union of the Organization of Islamic Cooperation (PUIC) in Algiers, the capital city of Algeria.

"We deeply regret this incident and are conducting a painstaking and thorough follow-up [investigation] on it," Iran’s top parliamentarian told the PUIC Conference, echoing other Iranian officials' earlier remarks.

He underscored that Azeri officials are abreast of the full details of the investigation.

“I deem it necessary to emphasize that [making] emotional decisions on the two countries’ relations is what the common and ill-wishing enemies of the Islamic world, especially the Zionist regime, want. It is necessary to be vigilant and careful about any decision that could have long-term consequences [for bilateral relations],” Qalibaf stated.

The speaker reaffirmed that so far, there is no sign to demonstrate that it has been a terrorist attack.

A guard has been killed and two others wounded in an attack on Azerbaijan’s Embassy in Iran on Friday. The attacker broke through the guard post, killing the head of security and injuring two others with a Kalashnikov assault rifle.

Police in Tehran announced they have arrested the assailant.

Iranian officials have noted that the enemies of the two countries should not be allowed to take advantage of the incident which Tehran announced was not an act of terrorism.

Qalibaf's comments came after Azerbaijani Deputy Foreign Minister Khalaf Khalafov said that Baku’s embassy in Tehran has suspended its work. According to the diplomat, Azerbaijan’s consulate general in Tabriz will continue to operate routinely.

A plane with the evacuated personnel of the Azerbaijani embassy in Tehran landed in Baku on Sunday evening.