Emergency services have been called to an industrial site in Port Talbot.
Eyewitnesses described hearing an explosion and there being a plume of smoke, but South Wales Police said it was a minor incident.
The force, along with crews from Mid and West Fire, and the Welsh Ambulance Service were called to BOC Gas & Gear, Margam, at about 14:40 BST.
One person was treated for shock and the Health and Safety Executive (HSE) has been informed.
A HSE spokesman said they were “aware and making initial enquiries”.
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