Law enforcement agencies have arrested more than 2,000 people in a 22-month investigation targeting Mexican drug trafficking organizations in the United States.
The probe, called Project Deliverance, focused on the transportation of methamphetamine, cocaine, heroin and marijuana along the Southwest border.
Over 400 of the 2,000 arrests were made Wednesday. Attorney General Eric Holder has scheduled a news conference on the operation Thursday.
The Drug Enforcement Administration, the FBI, and Immigration and Customs Enforcement worked on the effort with state and local law enforcement agencies.