A basement fire sent flames and smoke coursing through a seven-story Indian hospital Friday, killing 73 people, and officials accused hospital staff of abandoning many patients to die of suffocation, AP reported. As rescuers scrambled to evacuate survivors, police filed a case against the hospital in the eastern city of Kolkata for violating safety procedures, and top government officials vowed to hold the facility accountable and work toward revoking its license. The hospital expressed regret over the deaths, and denied any violations of safety measures. "It was horrifying that the hospital authorities did not make any effort to rescue trapped patients," said Subrata Mukherjee, West Bengal state minister for public health engineering. "Senior hospital authorities ran away after the fire broke out." Firefighters on long ladders smashed windows in the upper floors of the AMRI Hospital to pull trapped patients out before they suffocated from smoke inhalation, while sobbing relatives waited on the street below. Rescue workers took patients on stretchers and in wheelchairs to a nearby hospital. Moon Moon Chakraborty, who was in the hospital with a broken ankle, called her husband S. Chkraborty at home to tell him a fire had broken out. "She had died by the time I reached the hospital," her husband said. The fire killed 73 people, including three hospital workers, said Satyabrata Upadhyay, a senior vice president of the AMRI hospital company. The remainder of the dead were presumably patients and relatives who were aiding in their care. Rescue officials said many of the dead suffered from smoke inhalation. At the time of the blaze, there were 160 patients in the 190-bed hospital annex, Upadhyay said. The loss of life was "extremely unfortunate and painful," but the facility followed strict fire safety measure, he said. He promised to give 200,000 rupees, (about $4,000) to the relatives of the dead. "We deeply sympathize and share the pain and agony of the family members of the patients admitted here," he said. The expensive AMRI private hospital was recently rated one of the best hospitals in the city by an Indian magazine. However, safety regulations are routinely ignored at hospitals throughout India. The blaze erupted about 3:30 a.m. in the building's basement, and heavy smoke quickly engulfed the hospital. The cause of the fire was not immediately known. The fire and the smoke were first noticed by people living in a massive slum close to the hospital, according to witnesses. Some of them rushed to the hospital and raised an alarm, but security guards kept them back, saying there was a small fire in the kitchen and there was nothing to worry about. As the smoke enveloped the building, the slum dwellers joined in the rescue effort. It took firefighters more than an hour to arrive after the blaze started, said Pradeep Sarkar, a witness. His uncle was hospitalized hours earlier after suffering a heart attack at home, and he was moved to a nearby hospital after the fire broke out. The narrow streets in the neighborhood apparently made it difficult for fire trucks to get close to the building and for firefighters to bring in the big hydraulic ladders needed to evacuate those trapped inside. Eventually, they smashed the main gate to make way for the ladders. -- SPA