It has a population of just under 5,200 people , according to the U.S. Census Bureau . NEW : One man , 47 , is being held in Arnold 's home in North Dakota , a police chief says . NEW : Another man , 22 , is being ` ` detained for questioning '' in South Dakota , he says . Sherry Arnold was a teacher with the Sidney Public Schools in eastern Minnesota . She had last been seen six days ago out on a coffee run .
NEW : One man , 47 , is being held in Arnold 's home in North Dakota , a police chief says . NEW : Another man , 22 , is being ` ` detained for questioning '' in South Dakota , he says . Sherry Arnold was a teacher with the Sidney Public Schools in eastern Minnesota . She had last been seen six days ago out on a coffee run .