oil going up?Four oil rig workers were killed and 16 injured when a fire broke out on an oil production platform in the Gulf of Mexico early on Wednesday morning, Mexico’s state-run petro-giant Pemex has said. The explosion started with a fire in the dewatering and pumping area of the Abkatun A-Permanent platform, Pemex said, though it was not yet clear what had caused it. At least 300 workers were evacuated. The company confirmed the death of the four workers in a tweet. Pemex said it had eight firefighting boats battling the flames.