DUBAI, United Arab Emirates—The death toll from a fire at a major oil refinery in Kuwait has been raised to four after two critically injured workers died of their wounds, the Kuwait National Petroleum Company said in a statement Wednesday. The fire, which erupted Jan. 14 during maintenance work at the Mina al-Ahmadi oil refinery, initially killed two Asian workers, whose bodies were found on site, and had left five others in critical condition. The state-owned company said that two of the critically injured workers have since died in the hospital while receiving treatment, raising the death toll to four. The company’s top executive issued a statement in the days after the blaze saying such incidents, while “very painful for us,” are “very likely in a complex industry.” Kuwait’s Oil Minister Mohammed al-Fares and other top executives of the state-owned oil company visited the refinery immediately after the fire. They …