LAFAYETTE - Six people, including two defense attorneys and a deputy city marshal, have been arrested on state criminal charges related to a bribery investigation of a south Louisiana district attorney's office.

Louisiana Attorney General Jeff Landry announced Monday's arrests outside a Lafayette courthouse. Landry, who was elected in November, said the cases reflect his office's "renewed focus" on curbing public corruption by cooperating with federal authorities.

Landry said the arrests are related to a federal investigation that already has resulted in the convictions of six people, including three former employees of the district attorney's office in Lafayette.

In September, a judge sentenced private investigator Robert Williamson to 78 months in prison for his role in a "pay-for-plea" scheme that provided favorable treatment to defendants charged with drunken driving and other crimes.