Chevron is calling in experts from America to find out why an explosion
happened at its oil refinery in Pembrokeshire.

The company says the work in a storage tank was "planned" and "routine" which
had been carried out before.

Three male painters and a woman on fire-watch duties were killed - another is
in hospital with serious burns.

Public Affairs manager for Chevron - Jane James - says everyone at the plant
is in deep shock:

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