Police are investigating after saline bags were found to have been tempered with at the Cumberland Infirmary.
North Cumbria University Hospitals Trust said security measures had been increased across Cumberland Infirmary in Carlisle in the wake of the discovery.
Alarm bells were raised by a member of staff when they found a small number of saline bags which appeared to have been tampered with on Wednesday last week.
A spokesman for Cumberland Infirmary said there was no indiction that any patient had been adversely affected and immediately implemented its serious incident procedures.
Dr Rod Harpin, medical director at North Cumbria University Hospitals Trust, said; 'I can confirm that the trust contacted the police on Wednesday 4 January regarding a small number of saline bags at the Cumberland Infirmary in Carlisle which appear to have been tampered with. We immediately implemented our serious incident procedures and there is no indication that any patients have been adversely affected but we continue to monitor this closely. Patient safety is our absolute priority and we will continue to work closely with the police.'
If patients have any questions or concerns, they can contact the trust on 01228 814247.