BAGHDAD (Reuters) - An oil fire raged Sunday after saboteurs blew up a vital pipeline, threatening supplies to Baghdad's main refinery and fresh torment for drivers in the capital, Iraqi Oil Ministry officials said. It was the second major fire to damage Iraqi oil pipelines this month. U.S. officials blamed the first on a gas leak on the main export pipeline from the Kirkuk oilfields to Turkey. "This incident is an act of sabotage. The pipeline was blown up deliberately," said one Oil Ministry official of the latest blast. He did not elaborate and asked not to be named. A...