As Iranians headed to the polls April 29 to vote in the runoff parliamentary elections, a rare case of gun violence broke out. According to Hossein Zolfaghari, Iran’s deputy interior minister for security affairs, the shooting took place between supporters of rival candidates and was a “non-security” shooting, meaning that it was not terrorism related.

According to the deputy interior minister, the suspects had shot “aimlessly” into a crowd in Mamasani County in Fars province. Four people were wounded. A local official said that 25 people have been arrested and the injured have been transferred to a hospital.

Zolfaghari said that they had made preparations for the possibility of an outbreak of violence in Fars province, Chaharmahal and Bakhtiari province, and Khuzestan province. Of Iran’s 31 provinces, 21 provinces held elections in the runoff.

Ahead of the Feb. 26 parliamentary elections, violence had also erupted — this time in Khuzestan province. According to Seyed Rahma Mousavi, a provincial deputy police chief for social affairs, violence broke out between rival candidates in the city of Shoush. One person died and two were hurt as a result of injuries from a knife stabbing. Just days after those elections, violence also erupted in Kuhdasht County in Lorestan province after supporters of the losing candidate protested the results, causing damage to storefronts and property. Police used tear gas to disperse protestors, and officials even shut down Internet services in the area.