The CPS (Crown Prosecution Service) in Wales said no corporate manslaughter charges will be brought after an explosion which killed four workers at an oil refinery.
The investigation into the incident, which happened at a Chevron refinery – now Valero – in 2011, was described as “extremely complex”.
The families of Julie Schmitz 54, Dennis Riley, 52, Robert Broome, 48, and Andrew Jenkins, 33, were informed of the decision.
Police said they had “left no stone unturned” while investigating the incident.
The incident is still being investigated by the HSE (Health and Safety Executive) with both Chevron and Valero assisting.
Chevron said it remained “profoundly saddened” by the loss of lives in the incident, which also seriously injured a fifth person.
The fatalities occurred when a 160,578 gallon storage tank exploded, damaging a vessel next to it.
At the time of the incident, the refinery had been operated by Chevron, although a deal had already been struck to sell the plant to Valero.
A spokesman for Chevron said: “Everyone at Chevron remains profoundly saddened by the loss of lives. We continue to remember those individuals, families and colleagues affected by the incident.
“The investigation being conducted by the Health and Safety Executive is on-going and both Chevron and Valero continue to provide their full support and cooperation.
“Chevron remains deeply committed to the safety of employees, contractors and the communities where we work, and we strive continually to work safely.”
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