TEHRAN (Tasnim) � Iranian Foreign Ministry Spokesman Hossein Jaberi Ansari on Thursday strongly denounced Wednesday�s terrorist attack on a mosque in Nigeria�s Maiduguri, which killed more than 20 innocent people.

At least 22 Muslim worshippers were killed when a suicide bomber detonated himself in a mosque in Umarari Village, outskirts of Maiduguri, Nigeria, during the early morning prayers on Wednesday.

Jaberi Ansari condemned the attack and extended his condolences to the bereaved families of the victims.

�Recurrence of terrorist operations in different parts of the world indicates the necessity for adopting required policies and measures for an effective and all-out confrontation with terrorism and extremism,� he underlined.

Umarari, where the terror attack took place, is about 5 km south of Maiduguri, the northeast Nigeria city where Boko Haram insurgency birthed.

The blast is the first to be recorded in Borno state of Nigeria since the last that killed about 50 persons at an IDP camp in Dikwa, a town 85km away from Maiduguri.

"It was a suicide attack: the bomber sneaked in while the worshippers were observing the morning congregational prayer," an official of the Civilian-JTF, Alhaji Danbatta, said.

By Tasnim News Agency