Police have arrested a 27-year-old nurse in connection with the death of three patients at a Greater Manchester Hospital.
Officers arrested Rebecca Leighton at her home in Stockport, near Stepping Hill Hospital, where she worked. She remains in police custody.
An investigation was launched after a woman and two men died at the hospital.
The deaths are thought to have been caused by the deliberate contamination of saline solution with insulin.
A fourth patient, in his 40s, remains in a critical condition, the hospital said.
Police are also investigating a further 10 patients who were affected by the contaminated batch of saline from July and have since recovered.
The hospital is now ensuring medics work in pairs to check and administer drugs while a single key holder is in charge of locked drugs cabinets, with names and times of administration being noted.
Copyright © Press Association 2011
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