Police in Tajikistan have blamed an outlawed opposition party for a car-ramming attack that killed four tourists and that has been claimed by the Takfiri Daesh terrorist group.

Police said in a statement on Tuesday that a detained man, identified as the mastermind of the Sunday car-ramming attack — which killed two Americans, a Swiss and a Dutch national — was an “active member” of the so-called Islamic Renaissance Party of Tajikistan, which was outlawed by the country’s supreme court in 2015.

The statement identified the suspect as 33-year-old Hussein Abdusamadov.

The Daesh terrorist group had on Monday claimed responsibility for the attack in Danghara.

Although the assault was initially reported as a hit-and-run car accident, Interior Minister Ramazon Hamro Rahimzoda said on Monday that the assailants “had knives and firearms.” He added that one of the three tourists who survived the car-ramming but was stabbed was being treated in hospital.

According to a police statement released Tuesday, at least four people suspected of involvement in the attack were killed by police while another four suspects were arrested.