MEXICO CITY (AP) — The U.S. Treasury Department has imposed sanctions on six Mexicans linked to a pharmaceutical company that allegedly diverted precursor chemicals to a methamphetamine trafficking gang. The measure freezes any assets they have in the United States and bars Americans from doing any business with them. The U.S. Embassy in Mexico and the Treasury Department announced the decision in statements Thursday. The six include two executive officers of Productos Farmaceuticos Collins, which the U.S. says is part of a network that supplies pseudoephedrine to the Amezcua Contreras cartel. Phones rang unanswered at the Jalisco, Mexico-based company late Thursday.