The rights to explore Brazil's biggest oilfield have been won at an auction by a consortium led by Brazil's state-run Petrobras, backed by Total, Shell and Chinese firms. The group made the only bid in the auction, offering the minimum share of the surplus production. The Rio de Janeiro beachfront hotel, where the auction took place, was guarded by 1,100 security personnel. Earlier, striking oil workers opposed to the contest clashed with police. Eleven companies had expressed interest in the Libra oilfield, but the Spanish Repsol pulled out on Monday, leaving the five winners as the only ones to present...