Niger Delta Avengers claim five attacks in blow to cease-fire U.S. drillers bring back rigs as oil market seen stabilizing Brent crude traded near $50 a barrel as Nigerian militants claimed fresh attacks over the weekend, threatening to deepen the country’s biggest output losses in decades. September futures rose as much as 0.8 percent in London after advancing 1.3 percent Friday. The Niger Delta Avengers said they attacked five crude-pumping facilities overnight Sunday, dealing a blow to a government effort to enforce a cease-fire. Shale drillers in the U.S. brought back the most oil rigs of any week this year as confidence in a stabilized market prompts talk of expansion. “You end up with a rather bullish cocktail” when global supply losses are combined, Tamas Varga, an oil analyst at PVM Oil Associates Ltd. in London, said in a report. “Regular pipeline bombings, production shut-ins and force majeure in […]