OKLAHOMA CITY (AP) — Federal prosecutors say a man who has been spokesman for a group of armed civilians that patrols the U.S.-Mexico border is a flight risk and should remain jailed on accusations of impersonating a federal agent.

A grand jury in New Mexico indicted 44-year-old James Christopher Benvie last week on two counts of false personation of a U.S. officer or employee. The indictment alleges Benvie, of Minnesota, impersonated a U.S. Border Patrol agent in Dona Ana County, New Mexico, on April 15 and 17.

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The civilian groups have been widely criticized after videos surfaced showing them detaining immigrants.

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Benvie was arrested Friday in Guthrie, Oklahoma. Prosecutors say in court filings that Benvie is dangerous and should remain detained.

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His attorney, Bill Earley, didn’t immediately return a call seeking comment. A hearing is scheduled Tuesday in Oklahoma City.