UPDATE: Monsanto a focus of U.S. antitrust investigation

Thursday, October 8, 2009 | 5:42 p.m. CDT; updated 8:46 a.m. CDT, Friday, October 9, 2009

ST. LOUIS — The U.S. Justice Department is investigating whether Monsanto Co. violated antitrust rules in trying to expand its dominance of the market for genetically engineered crops, the company said Thursday.