BP has locked out union workers at its oil refinery in Indiana, according to reports from multiple sources. The action affects the company's Midwest refining operations at the facility.

The lockout represents an escalation in labor relations between BP and union workers at the Indiana refinery. During a lockout, management prevents workers from entering the workplace, typically as a negotiating tactic during labor disputes.

BP's Indiana refinery is a significant facility in the company's Midwest operations. The plant processes crude oil into various petroleum products for regional markets.

The specific details of the underlying labor dispute, including contract negotiations or worker demands, were not immediately available. Labor lockouts are relatively uncommon in the oil refining industry compared to strikes initiated by workers.

BP has not yet provided detailed comment on the duration of the lockout or its impact on refinery operations. The company typically maintains contingency plans to continue operations during labor disputes using management personnel and contractors.