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12 September 2011
Last updated at 03:04 ET
Police investigating contaminated saline at Stockport's Stepping Hill Hospital have narrowed their inquiries to three deaths.
Greater Manchester Police said insulin was administered unlawfully to Arnold Frederick Lancaster, Tracey Arden and Alfred Derek Weaver.
However a further four deaths had been ruled out of the investigation. Two others were dropped earlier.
Detectives are investigating 30 cases of saline contamination.
Officers are working closely with medical experts to scrutinise post-mortem examination results, medical histories and any medicines or drugs individuals may have received whilst at Stepping Hill.
Toxicology tests The force said it was still trying to establish whether the illegal insulin dose was "a significant contributing factor" to the three deaths.
A statement said a number of toxicology and other tests to try to establish causes of death were continuing and could take weeks to complete.
Assistant Chief Constable Terry Sweeney said: "I know relatives of the confirmed victims affected and the public in general will be anxious and want answers and we are working as quickly as we can without jeopardising the quality or integrity of the investigation."
Police have interviewed more than 300 out of the 700 staff, patients and visitors they intend to speak to.
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Greater Manchester Police said insulin was administered unlawfully to Arnold Frederick Lancaster, Tracey Arden and Alfred Derek Weaver.
However a further four deaths had been ruled out of the investigation. Two others were dropped earlier.
Detectives are investigating 30 cases of saline contamination.
Officers are working closely with medical experts to scrutinise post-mortem examination results, medical histories and any medicines or drugs individuals may have received whilst at Stepping Hill.
Toxicology tests The force said it was still trying to establish whether the illegal insulin dose was "a significant contributing factor" to the three deaths.
A statement said a number of toxicology and other tests to try to establish causes of death were continuing and could take weeks to complete.
Assistant Chief Constable Terry Sweeney said: "I know relatives of the confirmed victims affected and the public in general will be anxious and want answers and we are working as quickly as we can without jeopardising the quality or integrity of the investigation."
Police have interviewed more than 300 out of the 700 staff, patients and visitors they intend to speak to.
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