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Now, Ruby was carrying a revolver. He fired just once, and Oswald, hit on the left side just beneath the heart, doubled over. In a chaotic scene, some cops grabbed Ruby, others carried Oswald to an ambulance. He was rushed to Parkland Hospital. For two hours, doctors labored to save his life. According to the medical announcement, he had suffered a "massive injury to the abdomen with major vessel injury." Bleeding was finally controlled, but Oswald then suffered a "spontaneous stopping of the heart." An incision was made, and the doctors began massaging Oswald's heart with their hands—but the treatment did not work.