Musa , the Hai'a member, is seen hospitalized with severe burns after the petrol bomb attack. — Okaz photo Okaz/Saudi Gazette RIYADH – Security forces have arrested three persons accused of assaulting a member of the Commission for the Promotion of Virtue and Prevention of Vice (the Hai'a). Murshid Al-Musa was severely burned when a group of unidentified individuals attacked him with a petrol bomb during the Haj break. Security forces, sources said, are pursuing a fourth accomplice of the arrested trio. Murshid was with a Hai'a team investigating a network of people supplying alcohol and drugs. Musa Al-Musa, Murshid's brother, told Okaz/Saudi Gazette that Murshid was getting phone calls threatening him with revenge. “After performing Eid Al-Adha prayer, my brother went to his car and there some unknown individuals threw a petrol bomb at him and disappeared, Musa recounted. Murshid sustained severe burns to his body and was moved to King Khaled Medical City where he has undergone several operations. The attack was part of a recent spate of hostile attacks on the Hai'a by members of the Saudi public. __