Authorities are investigating a man suspected of murdering multiple people with a bow and arrow on Oct. 13.

Norwegian police near Oslo are questioning the suspect after he allegedly tried to resolve a “disagreement” by firing multiple projectiles, which killed five and seriously injured two about 6:15 p.m.

He was arrested within 30 minutes, and investigators want to find out whether the Vestiden attack was a terrorist act. The incident has been reported to Norway’s domestic security service, PST.

Among the hospitalized injured is an off-duty police officer.

“The man who carried out the act has been arrested by the police, and there is no active search for more people,” Police Chief Oeyving Aas said according to the Associated Press. “Based on the information we have, there is one person behind this.”

Acting Prime Minister Erna Solberg described the incident as “gruesome.” Incoming Prime Minister Jonas Gahr Stoere condemned the attack as a “cruel and brutal act.”

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