ENERGY

Nigerian Oil Drilling Activity Halted: Companies are pulling most staff from the country, which has been crippled by an oil workers’ strike, an official in the industry said. The official with oil-field service giant Schlumberger Ltd. said from Lagos that the company decided Saturday to pull out all but a handful of personnel and evacuate expatriate families. He said there were “no rigs operating” in Nigeria by Sunday and the effects of the pro-democracy strike--which enters its fifth week Monday--will soon “completely shut down the oil industry” in that country.