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Police have re-arrested a nurse in connection with poisoning deaths at a Stepping Hill hospital in Stockport.
Victorino Chua, 48, was held last year on suspicion of tampering with medical records at the hospital.
The father of two was questioned on suspicion of three counts of murder and various counts of causing grievous bodily harm.
Chua was due to answer his bail next week but was arrested at his home today after it is understood new evidence emerged in the inquiry.
Police have been investigating how saline solution was contaminated at the hospital, poisoning 22 patients in June and July 2011.
The deaths of Tracey Arden, 44, Arnold Lancaster, 71, and Derek Weaver, 83, are being treated as murder.
Five others died several months after it was believed they were poisoned.
They are among a number of cases being treated as grievous bodily harm.
Greater Manchester Police said today's arrest was the result of "new evidence" in the case.
Chua was first arrested in January 2012.
A nurse has been rearrested on the suspicion of three counts of murder and poisoning 18 others at Stepping Hill hospital.
The deaths of Tracey Arden, 44, Arnold Lancaster, 71 and Alfred Derek Weaver, 83, are all being treated as murder.
Victorino Chua, 48, has been arrested on suspicion of tampering with medical records and the contamination of intravenous medicines at the hospital in Stockport.
A nurse has been rearrested in connection with the deliberate contamination of products in Stepping Hill Hospital which led to the deaths of three people.
A nurse has been re-arrested in connection with the Stepping Hill poison probe.
Victorino Chua, 48, was taken by police from his home in Stockport earlier this morning.