YORK, Maine — Immigration officials have been called in to assist Maine officials who found about $1.5 million in a truck during a routine roadside safety check.

Foster’s Daily Democrat reports the U.S. Immigration and Customs Enforcement is investigating the Maine Turnpike case as a possible incident of cash smuggling. The agency has taken a lead role in combating bulk cash smuggling on the U.S. borders with Mexico and Canada.

Officials said the episode unfolded with the discovery of a falsified driver’s log during the routine truck inspection Friday. The driver, 35-year-old Jhon Rivera-Ramirez, was arrested in connection to the logbook violation.