For the murders of his final three victims, Christie modified the gassing technique he had first used on Eady; he used a rubber tube connected to the gas pipe in the kitchen which he kept closed off with a bulldog clip. He seated his victims in the kitchen, released the clip on the tube, and let gas leak into the room. The Brabin Report pointed out that Christie's explanation of his gassing technique was not satisfactory because he would have been overpowered by the gas as well. Nevertheless, it was established that all three victims had been exposed to carbon monoxide. The gas made his victims drowsy, after which Christie strangled them with a length of rope.