Oklahoma refinery blast probe could take months

OKLAHOMA CITY (AP) — It could take months for officials to determine what caused an explosion at an Oklahoma refinery that killed one worker and critically injured another, a spokeswoman with the U.S. Department of Labor said Monday.

The plant, Wynnewood Refining Co., owned by CVR Energy Inc. of Sugar Land, Texas, was shut down for scheduled maintenance and upkeep, known as a “turnaround,” when a boiler that was being brought back online exploded Friday evening. The turnaround resumed Saturday at the refinery.