TEHRAN (Press Shia Agency) – The number of people killed in a recent gun attack by the African country’s armed forces on a peaceful march held by Shiites ahead of the upcoming Arbaeen, surpassed one hundred.

According to Press Shia Agency dispatches, Nigerian armed forces on Monday opened fire on a group of Shiite mourners in the northern city of Kano, killing  more than 100 and injuring scores more.

The marchers, mostly members of the Islamic Movement of Nigeria (IMN), were moving from Kano to Kaduna to hold the rituals of Arbaeen, which marks 40 days after the martyrdom anniversary of Imam Hussein (AS), the grandson of Prophet Muhammad (PBUH).

On Tuesday, Iran’s Foreign Ministry slammed as unacceptable the killing of the Nigerian people, saying, “The recurrent scene of cruel massacre of Muslims in a peaceful religious procession without any threat and violence is worrying and unacceptable,”

He also called on the Nigerian government to remain vigilant in the face of violence and divisive factors, urging serious efforts to prevent such crimes against Muslims.

The attack was the latest in a series of incidents involving the group. A judicial inquiry in August reported that 347 IMN members were killed and buried in mass graves after clashes with the army in December 2015 when Nigerian forces raided the house of IMN leader Sheikh Zakzaky and arrested him after killing those attempting to protect him, including one of the movement's senior leaders and its spokesman.

The Sheikh himself was shot seven times during the attacks and blinded in one eye and still remains in custody of the army.