'Two dead' in refinery blast
Fire crews were called to the blaze at Chevron, Pembroke Dock, shortly before 6.30pm.
A spokeswoman for Mid and West Wales Fire Service said fire had completely destroyed a tank. Crews initially put out the blaze, then set about cooling the plant to prevent further explosions.
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Hide AdMilford Haven coastguards reported a "blast large enough to shake the windows" with "black smoke in the air".
Phil Horne, of Milford Haven, said: "I heard a large explosion, turned around and saw a fireball disappearing into the sky."