Police in Amsterdam said Saturday they were still investigating the cause of a fire which heavily damaged one of the city's largest hospitals but caused no injuries, DPA reported. The VUMC hospital in Amsterdam said Saturday it will not admit any new patients following a fire on its second floor. The first aid and dialysis departments remain closed. The measures were put in place after a fire broke out in the hospital just before 0400 GMT Saturday morning, resulting in heavy damage. Jean Savelkoul, vice-president of the hospital board, said the fire would have a great impact on the hospital's capacity to admit new patients. The fire broke out in an operating theatre on the second floor, sending thick smoke into large parts of the hospital. Patients were evacuated and brought to other sections of the hospital. No one had to be transferred to another hospital. By 0530 GMT fire brigades reported the fire had been extinguished. There was no surgery going on in the operating theatre where the fire started, nor was there any personnel present. Five out of the seven floors of the hospital were affected by smoke problems.