(Update) Security forces are searching for two male suspects in connection with the killing of a policeman and injuring two others during a botched armed attack on a police prison van in Giza late Tuesday, the Interior Ministry said Wednesday. The police launched a crackdown in Giza, south of Cairo, and would make arrests shortly following an ambush on a prison car near Ayyat Village in which one soldier was killed, and two others injured, the Ministry said in a statement Wednesday. The attack was apparently in revenge for the jailing of Abdul Aziz Hamza Abdul Aziz, a drug baron, who was arrested on many criminal charges and being transferred to prison to serve a five-year term, the statement said. Two members of his family, identified as Abdul Aziz' father and younger brother, are suspected of being behind the ambush in which the vehicle was raked with bullets, it said. "Policeman Mohamed Khalifa was shot dead on the scene. His colleagues Warrant Sergeant Mansour Mohamed and Sergeant Sayyed Gebril were shot in the leg and remained in the Police Hospital in Giza," added the statement. However, Abdul Aziz could not escape from the car after the two men, armed with automatic rifles, attacked the van shortly after it left the Giza Criminal Court, it said. The men, wearing face masks and riding a private car, threatened the van's driver and demanded Abdul Aziz' release, the statement said, adding that the suspects were still at large. "When the driver refused to stop, they opened fire at the vehicle, killing Khalifa and wounding his two colleagues, it said, adding that two prisoners were also injured in the attack. "None of the two attackers was shot in a subsequent firefight that erupted after they opened fire at the van. The two men fled," the statement added. The entire staff of the van has been questioned as part of the investigation into the high-profile attack, which was the latest in a string of embarrassing security lapses in Egypt.