Police investigating claims that patient records were falsified, which resulted in neglect, say they have arrested a second nurse.
Officers said they first began looking into the allegations after being contacted by Abertawe Bro Morgannwg University Health Board earlier this year.
Detectives’ investigations centre around accusations that patient notes were falsified at Bridgend’s Princess of Wales Hospital.
A spokesman for South Wales Police confirmed a 31-year-old woman had been detained.
“A second arrest has been made of a 31-year-old woman from Bridgend on allegations of falsification of entries in patients’ notes resulting in neglect,” he said
“The woman has been released on police bail while the investigation continues. She was suspended from her duties as soon as these issues were suspected.
“In the meantime, an independent medical expert will review the findings of the health board to establish if any patients suffered harm as a result of the allegations under investigation.”
The arrest is the second police have made in the case.
On May 29, a 28-year-old woman - also a nurse - was quizzed by officers before being released on bail.
The spokesman added: “We are also contacting all of the patients and the families who may have been affected.”
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