5 Min Read MEXICO CITY/LONDON (Reuters) - The commercial arm of Mexican state oil company Petroleos Mexicanos (Pemex) has temporarily banned new business with Trafigura AG, according to a document and a source, as investigations into the energy trader’s conduct in several countries deepen. FILE PHOTO: A tanker truck transporting fuel is pictured along the streets en route to a gas station, in Mexico City, Mexico January 15, 2019. REUTERS/Henry Romero/File Photo The world's largest independent commodity traders here are facing scrutiny globally for alleged corruption after years of investigations into bribes of public officials in several countries in Latin America.