SALT LAKE CITY (AP) — Utah is joining more than 20 other states in canceling classes at public schools for the rest of the school year to prevent the spread of the coronavirus. Gov. Gary Herbert said Tuesday that students will finish the year doing mostly online assignments. Public schools have been closed since March 16. Halting in-person classes has cast thousands of parents in the role of home school teachers as they guide students through online assignments. Utah joins states such as Arizona, Oregon and Washington that previously made the decision to cancel classes. About 667,000 children go to public schools in Utah.