A 77-year-old man died from smoke inhalation on Tuesday after a fire broke out in a hospital in Dusseldorf.
Four other persons are in critical condition with life-threatening injuries.
The fire broke out in a room on the second floor of the Marien Hospital, located in the western German city of Dusseldorf.
The fire department, said a total of 19 people had sustained injuries related to the fire, saying it was unclear whether they were patients or hospital staff.
The official said the cause of the fire remains unknown and an investigation has been launched by police and prosecutors.
However, the room, in which the fire broke out, burned out completely.
The fire department said firefighters managed to completely extinguish the fire as the oxygen line in the room was destroyed by the heat.
A police spokesman added that the evacuation of the section of the building that was filled with smoke was challenging.
Bedridden patients had to be brought to other areas of the hospital, while more than 100 patients were taken care of in the car park outside the hospital.
Most of them were suffering from symptoms caused by previous illnesses and not by the fire or the smoke.
In July and August, two people were killed in a hospital fire in other German cities.
The German foundation for the protection of patients said that fire protection measures in German clinics and nursing homes were insufficient.
The foundation added that precautionary equipment, such as sprinklers, were needed.
Edited by Hadiza Mohammed/Abdulfatah Babatunde