The Saudi medical team, currently performing a sensitive surgical operation to separate Polish Siamese twins, has successfully accomplished phase-4 of the several hour operation, surgeons taking part in the operation told the press here today. Following the three-hour partial operation dedicated to separate the urinary and reproductive systems, Dr. Saud Aljada'an, Dr. Mohammed Alnamshan and Dr. Saud Alshinaifi, all pediatricians, told newsmen awaiting outside the operation room to cover the event which is expected to last for 15 hours, that everything is going well according to schedule and without any difficulties. The two Siamese twins are undergoing the surgery at the expense of Crown Prince Abdullah bin Abdulaziz, the Deputy Premier and Commander of the National Guard.