Security Spokesman of the Ministry of Interior said in a statement that at 01:12 a.m. on Friday, security authorities received a report that twin brothers Khalid and Saleh (sons of Ibrahim bin Ali Al-Arini who were born in 1417H) stabbed their mother (67 years old), father (73 years old) and brother Suleiman (22 years old) in their home in Hamra District, Riyadh. As a result of his terrorist act, the mother died, and father and brother were seriously injured and taken to the hospital in critical condition. The spokesman also said that sharp knives and chopper seized in the crime scene were brought by the twin brothers from outside the house to be used in committing their crime. After committing the crime, the twin brothers left the house, steal a car by force from an expatriate and fled away. The security authorities managed to arrest the twin brothers at dawn today in Dilam Town, Kharj Governorate. Investigations are underway to uncover the circumstances of this heinous crime. The condition of the injured are being followed-up, the spokesman said.