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Investigation into saline bag tampering.

Hospital managers are continuing to work with police in an investigation launched after saline bags at Carlisle's Cumberland Infirmary were tampered with.

A spokeswoman for North Cumbria University Hospitals NHS Trust, which runs the infirmary, said managers are still working alongside Cumbria Police a year after the discovery.

Police have confirmed that a woman remains under investigation as part of the inquiry.

The health trust spokeswoman said: “The trust has been working closely with the police since January 2017 when a small number of saline bags appeared to have been tampered with at the Cumberland Infirmary.

"There was no patient harm or adverse effects related to this incident and we will continue to support Cumbria Police with their investigation.”

The alarm was raised after a member of the hospital staff discovered several suspect saline bags on January 4 2017.

Detective superintendent of Cumbria Police, Andy Slattery, is overseeing the investigation and a woman was arrested, questioned and released in July 2017.

A police spokesman added: "A 24-year-old woman, from Wigton, was arrested on suspicion of attempting to pervert the course of justice and appearing to contaminate goods. She was released under investigation. Police will continue to work closely with North Cumbria University Hospitals Trust as enquiries continue."

Saline bags contain solutions of sterile water and small amounts of salt. They are commonly used to mix drugs routinely administered to patients via a drip. The bags have a wide variety of uses including supplying fluids to rehydrate patients unable to keep water down. Sometimes medicines are injected into the bags so they can be fed directly into a patient's bloodstream.

Following the scare, all saline bags were removed from the hospital and replaced as a precaution.

The trust, which runs the hospital, immediately implemented its serious incident procedures at the time.

Work was carried out to review medicines across the hospital and to increase security.