(CBS/AP) BILLINGS, Mont. - High school math teacher Sherry Arnold went for a run in her northeast Montana hometown early Saturday morning and has not been seen since.
According to CBS affiliate KTVQ, a massive search Saturday turned up a shoe authorities say she was last seen wearing near one of her regular routes. On Sunday, hundreds of volunteers, National Guard troops, several aircraft and three dog teams continued the search, to no avail.
"We're covering residential, we're covering rural, we're covering everything, looking underneath everything and just trying to see if we can find some sort of clues. We spent about four hours out and on the way back on the bus, it was complete silence. There was no talking because nothing was found," Sidney resident Libby Berndt told KTVQ.
Arnold, 43, has taught math in Sidney, Mont., for 18 years. She was reportedly last seen around 6:30 a.m. Saturday, wearing a blue sweatshirt with a white stripe, red nylon pants with black leggings.
Anyone with information is being asked to call the Sidney Police Department at 406-433-2210.