Two companies are to face prosecution following an incident at a refinery seven years ago which resulted in the deaths of four people and serious injuries to another.
The Health and Safety Executive said Valero Energy UK Limited and B&A Contracts Limited are to face charges under the Health and Safety at Work Act following the incident in Pembroke, west Wales.
The charges relate to the deaths of Dennis Riley, Robert Broome, Andrew Jenkins and Julie Jones and major injuries to Andrew Phillips, who were working on the Amine Recovery Unit when an explosion and fire took place.
The defendants are due to appear at Haverfordwest Magistrates’ Court on September 24.
The HSE’s deputy director of field operations, Jane Lassey, said: “Following a painstaking and extremely thorough investigation, much of which was conducted jointly with Dyfed Powys Police, we have concluded that there is sufficient evidence to bring criminal charges.”