Investigation into 3 Deaths at Stepping Hill

At Stepping Hill Hospital, security has been heightened following the poisoning of patients, with 14 affected and 3 deaths. The police are investigating, focusing on hospital staff and visitors. An experienced nurse noticed unusual blood sugar levels, leading to the discovery of tampered saline solutions. The hospital has increased security and replaced saline ampoules. The police are treating the deaths as suspicious and await toxicology results.

What was believed to have been injected into the vials that caused the issue?

What is the current status of the police investigation regarding the contaminated saline?