One man and three women are arrested amid allegations of mistreatment and neglect at a hospital.
Blackpool Victoria HospitalImage copyrightBlackpool Teaching Hospitals NHS Foundation Trust
Image caption The investigation relates to patients on the stroke unit at Blackpool Victoria Hospital

Four healthcare professionals have been arrested on suspicion of administering poison or a noxious substance to patients at a hospital.

One man and three women have been held amid allegations of mistreatment and neglect at Blackpool Victoria Hospital.

Police are investigating after concerns were raised about the care provided to some patients on the stroke unit.

Two women and a man previously arrested as part of the inquiry were released under investigation.

The seven suspects, who are all healthcare professionals, have been suspended as part of safeguarding procedures while investigations continue.