MADINA: Authorities arrested a man who is suspected of murdering his two brothers-in-law Monday in Mahd Al-Dhahab, some 260 kilometers southeast of Madina, police said. The unidentified man, 30, was at a rest house with his two brothers-in-law and a family dispute ended with him killing both of them with a machine gun, said Col. Mohsin Al-Raddadi, a Madina Police Department spokesman. One of the brothers, a school principal, died at the scene and the other, a nurse, was pronounced dead at the hospital, Colonel Al-Raddadi said. The man was arrested shortly after the shooting and investigations are ongoing, the spokesman said.