tanker is believed to have exploded at the plant in Pembroke Dock.

Fire crews have been called from across the area to tackle the blaze.
A spokesman for Chevron said: "At 18:20 local time on June 2 2011 an incident occurred at the Pembroke refinery.
"Emergency services were called and responded immediately and remain on the scene.
"The fire has been extinguished.
"We are taking appropriate action to respond to the situation. We are still in the process of accounting for all personnel."
According to the company website, the Pembroke Dock refinery specialises in processing heavy, lower quality crudes.

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