PORTLAND, Ore. (AP) — A bitter and occasionally violent two-year labor dispute at Northwest grain terminals ended with a tentative deal reached in the middle of the night.

The Federal Mediation and Conciliation Service said the International Longshore & Warehouse Union and Pacific Northwest grain companies reached the agreement Monday shortly before midnight. If ratified, the agreement ensures that U.S. grain exports proceed without disruption during harvest. Details of the deal were not divulged.