UPDATE: The suspect in the alleged abduction has been arrested in Casper at 5:30 Thursday afternoon.

60-year-old Rodney Zahn was arrested without incident.

Police say they got a report of a vehicle matching the description of the suspect's truck, and it was stopped at the corner of 1st and Center Streets.

The subject of the alert, 16-year-old Sandy Moore is safe and in police custody.

Roger Gray/Townsquare Media
Roger Gray/Townsquare Media
Roger Gray/Townsquare Media

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AMBER ALERT: Law enforcement is asking the public for help to find a missing Montana girl.

Authorities believe 60-year-old Rodney Zahn, a violent, registered offender violating his probation, took 16-year-old Sandy Moore from her Sheridan, Mont. home during the night. According to the Amber Alert, Moore is mentally delayed.

Moore's WIC card was reportedly used in Dubois at 9:45 a.m. Thursday. Zahn may be taking her to Billings, Mont.

Moore was last seen wearing a white shirt with black short sleeves and jeans. Zahn is a white male, 5'7" tall, weighing 135 pounds with brown eyes and grey and brown short hair. He reportedly has a Tasmanian Devil tattooed on one of his arms and a tattoo of a cross on his left hand.

Authorities believe Zahn has Moore in a black 1987 Ford pickup with Montana license plate 3-50558B. A white toolbox and green bicycle are believed to be in the bed of the truck, which is towing a white fifth-wheel trailer with a red generator and blue cover on the back of the trailer.

Anyone with information on the whereabouts of Sandy Moore or Rodney Zahn is asked to call 911 or the Madison County Sheriff's Office at 406-843-5301.