Racial tension has been building at Owatonna High School this week after a fight broke out Monday between white and Somali students, prompting heightened police presence, backpack searches and widespread parental worries. Owatonna Police Chief Shaun LaDue said between six and 15 officers have been assigned this week to the school, which usually uses one liaison officer. Principal Don Johnson said the problems began when two white students wrote papers in recent weeks that were "inflammatory and very disrespectful." One student handed out copies of his paper to friends, while the other posted his on a class blog. Both were...