(AP) — Four Nebraska men have been charged in separate federal indictments of failing to register as sex offenders.

Twenty-seven-year-old Duane Levering, of South Sioux City, and 34-year-old Stephen Tanner, of Omaha, are each accused of failing to register in March.

Thirty-four-year-old James Thompson is charged with failing to register from February through May. Federal authorities did not say where Thompson lives.

Thirty-six-year-old Oscar Gonzalez Jr., of Lexington, is accused of failing to register from October to May.

All the men were charged in indictments handed down Thursday. Each faces up to 10 years in federal prison if convicted.