Mohammed bin Faris bin Fatnan Al-Muteiri, a Saudi national, was beheaded here today after being convicted of murdering his mother, Salima bint Sanad Al-Muteiri, and his sisters: Faiza and Fawzia, as well as his uncle Shareed bin Fatnan al-Muteiri and his father's second wife - Ai'dah bint Marzouk al-Muteiri by shooting them under the influence of the drug he had used, said a statement released by the Interior Ministry. The culprit was convicted by the court and the verdict was approved by the cassation court and the supreme judicial council. The statement confirmed the determination of the Saudi Government to ensure law and order and to severely punish the criminals.