(Businessweek) — BP Plc’s efforts in the Gulf of Mexico to permanently stop the biggest oil spill in U.S. history were delayed by a storm building over the Bahamas. BP installed a cement plug yesterday as a precaution in a relief well that’s been drilled to within about five feet (1.5 meters) of the damaged Macondo well, Senior Vice President Kent Wells told reporters on a conference call. The U.S. National Hurricane Center said today the storm has developed into a tropical depression and warnings have been issued for the Bahamas and southern Florida.

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