A total of 138 people were hospitalized after inhaling the poisonous gases; they were treated at four local hospitals. Among the hospitalized were nearly 100 hotel guests, and several firemen and ambulance drivers; most of the patients were released from the hospitals within three days of the incident. A 55-year-old man was the sole casualty in the incident. An investigation into the cause of the gas leaks concluded on July 19, 1977, and found that a defective exhaust line on one of the emergency generators was responsible. The line had been installed during the hotel's construction. John Pisciotta, director of the Clark County Building Department, did not believe that he or anyone else would be able to determine how the line became damaged. Summa brought in the company which installed the system to have it repaired.