WHITING, Ind. (AP) – Union members at a BP refinery in northwest Indiana have voted to approve a new contract and end a strike lasting more than three months.

The (Munster) Times (http://bit.ly/1dYZttw ) reports refinery workers with United Steelworkers Local 7-1 are expected to go back to work next week at the plant in Whiting.

About 1,100 workers have been on strike, and the refinery has been run by non-union supervisors and replacement workers.

An estimated 92 percent of refinery workers in the union voted to approve the four-year agreement. BP and the union had reached a tentative agreement to end the strike in late April.

The agreement includes bargaining rights over safety and working conditions. The union had said low staffing levels could cause accidents.