The six women and three men killed were in the intensive care unit of Qaem Hospital, local authorities said. All the patients in the facility were evacuated.
Mohammad Taghi Ashoubi, the head of the Gilan University of Medical Sciences, told reporters on Tuesday that an intubated patient who was in the intensive care unit had died, while eight others were killed earlier.
“The cause of death of these patients is being investigated by the Gilan medical examiner,” he was quoted as saying by the state-run IRNA news agency.
Five infants who were at Qaem Hospital were transferred to the 17 Shahrivar Children’s Hospital and were in good health, he said.
The fire started in a room on an underground floor of the hospital, where the emergency power generators were located, state media reported.
The authorities have not commented on unconfirmed reports that the fire broke out after the extensive use of emergency power generators amid power cuts as Iran endures scorching summer heat.
The fire is believed to have started at about 1:30am (22:00 GMT on Monday) and the cause was being investigated.
The 250-bed hospital was caring for 142 patients at the time of the incident, 33 of whom were in intensive care. Dozens of people had to be transported to multiple healthcare facilities in the area.
Interior Minister Ahmad Vahidi said he has been in contact with provincial officials to coordinate assistance for the injured, ensure the safety of the hospital to restart operations, and investigate the cause of the fire.
Hadi Salimi, the head of the Red Crescent Society in the province, told state media that 26 teams comprising 75 emergency responders were dispatched to the hospital from eight counties.