Representatives of the major oil companies and the United Steelworkers Union returned to the table on March 9, 2015 to resume talks regarding a three-year labor contract during a strike by workers that has now entered its sixth week. The union called for the strike on February 1, 2015 after contract negotiations failed. The nationwide strike has spread to 15 locations, mostly refineries, in seven states, including three locations in Louisiana: Motiva refineries in Convent and Norco and the Shell Chemicals plant in Norco. Workers are also striking in Texas, California, Kentucky, Washington, Indiana and Ohio. The Louisiana locations alone involve 800 workers and a refinery capacity of 465,000 barrels of oil per day. The 12 refineries affected by the strike account for one-fifth of the United States capacity for oil production.