Stunned Russians Observe Day of Mourning BESLAN, Russia - A numb Russia observed the first national day of mourning for the hundreds of victims of the terrorist school seizure on Monday, while desperate families searched for the missing and foreign planes delivered medical supplies to this grief-stricken southern region neighboring Chechnya.    In Beslan, townspeople crowded around the coffins of children, parents, grandparents and teachers ahead of the 120 burials scheduled in the town cemetery and adjoining fields...