Brent oil swung between gains and losses near $30 a barrel as Iran moved closer to boosting exports and exacerbating a global glut. Futures advanced as much as 1.1 percent in London following attacks in Indonesia , reversing losses of 1.9 percent in early trade Thursday. Brent slid below $30 a barrel Wednesday for the first time since April 2004 amid speculation sanctions on Iran may be lifted by next Monday, paving the way for increased shipments. U.S. stockpiles gained by 234,000 barrels last week, according to government data. “We are likely to get the news over the weekend that Iranian sanctions are to be lifted, so next week expect continuing mounting pressure,” Eugen Weinberg, head of commodities research at Commerzbank AG, said in a Bloomberg Television interview. While prices are “pretty close to the bottom,” there’s still “continued negative sentiment on the market.” Brent capped a third annual […]