Using sophisticated smuggling networks, the traffickers have transported a portion of the pilfered petroleum across the border to sell to U.S. companies, some of which knew that it was stolen, according to court documents and interviews with American officials involved in an expanding investigation of oil services firms in Texas.

The widespread theft of Mexico’s most vital national resource by criminal organizations represents a costly new front in President Felipe Calderón’s war against the drug cartels, and it shows how the traffickers are rapidly evolving from traditional narcotics smuggling to activities as diverse as oil theft, transport and sales. Read the full story