Workers at three major US oil refineries operated with Royal Dutch Shell went on strike Saturday in a dispute over safer working conditions.
Some 5,200 workers operating around a dozen installations have been on strike since February 1 demanding improved wages and safety conditions.
The United Steelworkers (USW) said the strike has reached workers at the huge Motiva Enterprises refinery in Port Arthur, Texas, the largest refinery in the United States which produces more than 600,000 barrels per day.
