PATTANI, Thailand (AP) — Thai police believe Islamist insurgents fired grenades at a fair in southern Thailand, injuring 30 people, in anger over government efforts to win over local Muslim religious leaders.

Police Lt. Col. Krajang Raknarong said Sunday the attackers fired grenades at a security checkpoint near the trade fair in Narathiwat province’s Bajoh district on Saturday. Thirty people were hurt, four seriously, when two grenades exploded near fair booths.