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. Last Updated: 07/27/2016

Group Decries Spill

MILFORD HAVEN, Wales () -- Conservationists say a southwest Wales oil tanker spill is much bigger and more harmful to birds, seals, dolphins and other wildlife than authorities have stated.

Official estimates put the spill at 70,000 metric tons -- one of the 10 biggest tanker spills in history.

But Stephen Mulholland, head of the Welsh section of Britain's Royal Society for the Prevention of Cruelty to Animals, said: "It is already clear that the spill is substantially larger than so far stated by the authorities.''

The tanker Sea Empress ran aground at St. Ann's Head at the mouth of Milford Haven estuary Feb. 15.