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FAYETTEVILLE, Ark.– Federal prosecutors said the last of 11 people picked up in an operation targeting methamphetamine trafficking in northwestern Arkansas have been sentenced.

U.S. Attorney Conner Eldridge said the people involved moved large amounts of meth from California to Arkansas.

The last of the sentencing hearings were held Monday in Fayetteville.

Others have occurred since March.

Prosecutors said the investigation began in April 2014.

Investigators conducted a number of buys and surveillance and seized 10 pounds of meth and eight weapons.

One weapon taken was a fully automatic rifle.

The sentences for the defendants ranged from 15 months to 24 years.

Prosecutors said some defendants were found to be career offenders.