Oil prices edge lower on concerns about demand

Oil edged lower on Wednesday, extending losses to a third straight session, as investors grew concerned over consumption due to weaker demand from refineries and potentially slower economic growth after Britain's decision to leave the EU. Despite record demand from drivers across the United States, an excess of gasoline worldwide has weighed on refineries' profitability, leading some to cut runs and throwing the demand for crude oil in doubt. "Oil once again is testing key support levels and the