An Egyptian court trying Hosni Mubarak over the killing of protesters who ousted him convened Wednesday to hear more testimonies after police witnesses suggested this week that neither he nor his interior minister gave orders to shoot. Mubarak, who has been in hospital since April and attended all three court sessions on a stretcher, arrived by helicopter, state TV said. Cameras have been barred in court. Egyptians who helped oust the 83-year-old Mubarak after 30 years in power have regularly gathered at the court on the outskirts of Cairo demanding swift justice for about 850 people killed in the uprising. Opponents of Mubarak and lawyers of the families of victims have voiced frustration with the witnesses at Monday's session, attended by Mubarak lying on a hospital trolley in the defendant's cage. Lawyers said the court could hear three more witnesses Wednesday, depending on the time each took. There was a heavy police presence outside the court to prevent scuffles with Mubarak's supporters. Lawyers representing families of victims said the police witnesses Monday give different answers before the trial. “They have changed the testimonies they previously gave to the prosecution which makes them unreliable,” Amir Salem said. A top police officer told the court Monday he was not aware of any order to fire on protesters although he said police were given live ammunition to protect the Interior Ministry. General Hussein Saeed Mohamed Moussa, in charge of communications for state security, said he believed the decision to issue arms was taken by a senior police officer, Ahmed Ramzi, who is on trial alongside Mubarak and former Interior Minister Habib Al-Adli. Two other police witnesses said they were told to exercise “self restraint” during the uprising. Also standing trial alongside the former president and former interior minister are Mubarak's two sons, Alaa and Gamal, and six police officers, including Ramzi. Egypt's justice minister agreed to let five Kuwaiti lawyers join the Mubarak defense team, the state news agency MENA said.