HOUSTON (Reuters) – The United Steelworkers union (USW) rejected a pay increase offered by lead oil company negotiator Marathon Petroleum in talks for a agreement covering U.S. refinery workers, people familiar with the matter said on Friday.

The offer was for a 4% pay increase over three years for 30,000 refinery and chemical plant workers represented by the union, the three sources said.

(Reporting by Erwin Seba; Editing by Leslie Adler)