Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. 2,000 Arrested in US Probe of Mexican Drug Cartels VOA News 10 June 2010 U.S. Attorney General Eric Holder has announced the arrests of more than 2,000 people in the United States as part of a 22-month investigation targeting Mexican drug trafficking networks. In Washington Thursday, Holder said that more than 400 of those arrests were made on Wednesday in 16 U.S. states as part of the investigation, dubbed Project Deliverance. Holder describes the operation as the most extensive and successful law enforcement effort to date targeting the Mexican cartels.  He says the investigation has resulted in the arrests of 2,266 people and the seizure of more than $150 million in U.S. currency. He says 2.5 tons of cocaine and 69 tons of marijuana were seized, along with hundreds of weapons and vehicles. Holder also expressed regret at the death of of a teenager who was killed this week by a U.S. Border Patrol agent. He says an investigation is under way. Mexico is demanding an "exhaustive investigation" into the killing of Sergio Hernandez at a bridge crossing between El Paso, Texas and Ciudad Juarez, Mexico. The FBI has said the shooting occurred as Customs and Border Patrol agents responded to a group of suspected illegal immigrants being smuggled into the U.S. Officials say that as agents detained two suspected illegal immigrants on the U.S. side of the border, other suspects ran back into Mexico and began hurling stones. The FBI says one agent told the stone-throwers to stop, but they continued. The agent fired his weapon several times, hitting the teenager who later died. The immigration debate in the United States has intensified since the southwestern state of Arizona, which borders Mexico, passed a law that requires police to check the residency status of anyone they suspect is in the United States illegally. Civil rights groups in the U.S. say the law discriminates against people based on race. Supporters of the law say it will help combat a wave of crime blamed on illegal immigrants.  Some information for this report was provided by AP. .