Bucharest , Romania ( CNN ) -- A fourth newborn baby has died after a fire in the intensive care unit of a maternity hospital in Romania , a hospital official said Tuesday . The baby died at the Grigore Alexandrescu Hospital , where another seven were being treated , said Dr. Radu Balanescu , the hospital 's medical director . One of those babies was in poor condition Tuesday and the other six were stable , he said . Autopsy results on three babies whose deaths were announced earlier show that one died from smoke inhalation and the other two died from lack of oxygen , said Marcus Iacob , the prosecutor in charge of the investigation . All the babies have been identified , Balanescu said , but officials still planned to run DNA tests to confirm their identities . The fire at Giulesti Maternity Hospital in the capital , Bucharest , began Monday after an electrical cable in the air conditioning system caught fire behind a wooden closet in the intensive care unit , according to prosecutors ' preliminary conclusions . The cable had not been installed and isolated properly , they said . Pictures of the burned intensive care unit , published Tuesday in the Romanian newspaper Adevarul , showed a burned incubator , a blackened room , and equipment that had melted and was singed . Prosecutors said the fire burned slowly for about an hour before any medical staff entered the room . The intensive care room had been unstaffed at the time , they said . As a result , prosecutors called for the questioning of 15 medical staff , including the nurse who was supposed to be in the room at the time , Iacob said . Staff also failed to evacuate any babies in the five minutes between the time they placed the emergency call and firefighters got to the burning intensive care unit , fire department spokeswoman Anca Onofrei said . Everyone in the hospital was eventually evacuated , including five women in labor , another 26 pregnant women , and six who had just given birth , Raed Arafat , state secretary deputy in the Health Care Ministry , said Monday . The Romanian press was critical Tuesday of the staff 's response , saying it showed the weakness of the Romanian health care system . Dr. Gheorghe Burnei , a renowned surgeon with the Children 's Hospital Marie Curie in Bucharest , told Realitatea TV that due to the poor Romanian health care system , this kind of tragedy could happen again at any time .
A fourth baby dies from Monday 's fire at a Bucharest hospital . Another seven are being treated for injuries . Preliminary conclusions show the fire started in a cable behind a wooden closet . Pictures show a blackened hospital room and a burned incubator .