Federal prosecutors today unveiled a dozen new indictments charging that accused Mexican drug cartel members pumped vast quantities of drugs into major U.S. cities.

Ten accused cartel leaders and dozens of others are charged in indictments unsealed in Chicago and New York. Many of the suspects charged are already being hunted by U.S. and Mexican authorities.

The new court documents depict a sprawling distribution network stretching back nearly two decades, based on investigations by the Drug Enforcement Administration, Immigration officials and the IRS.

Authorities contend three suspects oversaw the shipment of nearly 200 metric tons of cocaine and large amounts of heroin into the United States.

The indictments grew out of a street gang investigation in Chicago and drug-related killings in New York.