One worker died and another was seriously injured in an accident at a Polish-controlled oil refinery. Both workers were Polish..."A metal pipe fell on two workers, ages 55 and 51...We are investigating the causes of the incident," Mindaugas Voldemaras, spokesman of the Mazeikiu Nafta refinery, said...The fatal accident occurred two weeks after Lithuanian prosecutors accused two American executives running the refinery [Paul Nelson English & Barton Lee Luck], of negligence that led to a fire last October...They have reportedly denied the charges leveled against them...Mazeikiu Nafta, Lithuania's largest corporation, was sold last year to Poland's PKN Orlen...