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21 July 2011
Last updated at 08:47 ET
A fourth patient has died at a hospital in Greater Manchester, after saline solution was found to be contaminated.
The man's death comes after Tracey Arden, 44, Arnold Lancaster, 71, and George Keep, 84, all died at Stepping Hill Hospital in Stockport.
Police believe insulin was deliberately injected into saline containers.
Nurse Rebecca Leighton, 27, of Heaviley in Stockport, has been arrested on suspicion of murder, in relation to the three previous deaths.
It is understood the fourth patient was a man in his 40s who was critically ill for several days.
Ms Leighton remains in police custody, after being arrested at her home in Buxton Road on Wednesday morning.
Officers removed six bags of items and a computer from the flat.
Detectives have been given extra time by a superintendent to question her. They have now have until 1800 BST, or will have to apply to the magistrates' court for further time.
The Nursing and Midwifery Council has said proceedings were under way to suspend her nursing registration while she was under investigation.
The four patients are among a total of 14 whose treatment since 7 July is being examined by police.
Greater Manchester Police were called to the hospital after an experienced nurse reported a higher-than-normal number of patients on her ward with "unexplained" low blood sugar levels.
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The man's death comes after Tracey Arden, 44, Arnold Lancaster, 71, and George Keep, 84, all died at Stepping Hill Hospital in Stockport.
Police believe insulin was deliberately injected into saline containers.
Nurse Rebecca Leighton, 27, of Heaviley in Stockport, has been arrested on suspicion of murder, in relation to the three previous deaths.
It is understood the fourth patient was a man in his 40s who was critically ill for several days.
Ms Leighton remains in police custody, after being arrested at her home in Buxton Road on Wednesday morning.
Officers removed six bags of items and a computer from the flat.
Detectives have been given extra time by a superintendent to question her. They have now have until 1800 BST, or will have to apply to the magistrates' court for further time.
The Nursing and Midwifery Council has said proceedings were under way to suspend her nursing registration while she was under investigation.
The four patients are among a total of 14 whose treatment since 7 July is being examined by police.
Greater Manchester Police were called to the hospital after an experienced nurse reported a higher-than-normal number of patients on her ward with "unexplained" low blood sugar levels.
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