A THIRD suspected robber has been arrested following an armed raid on a branch of Prasac microfinance institution in Pailin last week. Nob Srey Yuth, deputy chief of Pailin police, said yesterday that 25-year-old Sok Chamroeun was arrested yesterday while travelling in a taxi from Banteay Meanchey province to Siem Reap. Around US$9,000 worth of currency was stolen from the branch on Friday. A security guard was shot in the shoulder during the robbery.