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Four Killed in U.K.’s Deadliest Refinery Explosion Since 1974

Four workers were killed when a storage tank exploded and caused a fire at Chevron Corp’s Pembroke plant in Wales yesterday, in the U.K.’s worst refinery disaster for almost four decades.

Another worker was hospitalized with serious injuries, San Ramon, California-based Chevron said in a statement. Output at the 210,000 barrel-a-day refinery wasn’t disrupted and an investigation is under way.