CAIRO (AFP) - Ousted Egyptian president Hosni Mubarak and his two sons, Alaa and Gamal, are to face trial on August 3 on charges of ordering the killing of protesters and fraud, a judicial source told AFP Wednesday. The trio will be tried by the North Cairo criminal court and the hearing will be presided by Judge Ahmed Rifat, the source said. Businessman Hussein Salem, a close associate of the Mubaraks, is to face trial on the same date on the same charges, the source said. Mubarak has been in custody in hospital since April 13 after reportedly suffering a heart attack during questioning about the killing of anti-regime protesters and fraud.