More workers in Norway's oil sector walked out of wage talks on Wednesday, sending the dispute to a state mediator and raising the prospect of a repeat of a 2012 strike. Workers who operate onshore supply bases broke off talks, joining platform oil workers and oil service employees in breaking off wage negotiations, the Norwegian Oil and Gas Association, the energy companies' interest group, and trade union Industri Energi said. "This was the third wage negotiation this year and the third one that is going to mediation," Jan Hodneland, the chief negotiator for oil firms said. The association said unions had made unreasonable pay demands for work on holidays and outside regular business hours.