Four more people may have been poisoned by contaminated saline at a hospital in Greater Manchester, police believe.
The investigation into the suspected poisoning at Stepping Hill Hospital in Stockport focused on around 40 potential victims and police now think seven of those could have been harmed by the contaminated saline.
Tracey Arden, 44, Arnold Lancaster, 71, and Alfred Derek Weaver, 83, have already been named as victims.
Police are still searching for the person behind the contamination and sources claim they have brought in a Cracker-style criminal profiler.
Although not part of the investigation, the forensic clinical psychologist has assisted detectives by drawing up a profile of the suspected saboteur.
Security measures at the hospital have been heightened since the discovery of the saline sabotage.