More than two dozen people have been indicted in California for their roles in a cross-border drug ring that sent methamphetamine to the United States from Mexico.

Federal authorities say 16 of 27 people were arrested Thursday as part of a 16-month investigation. They each face drug conspiracy charges and will be sentenced to a minimum 10-year prison term if convicted.

Investigators say the ring involved members of the La Familia Michoacan drug clan as well members of two Latino gangs in Southern California.

They say methamphetamine was imported in an unfinished or liquid state and then was crystallized for sale on the streets. In most cases, the drug was 99 percent pure.