Classes resumed at an elementary school in central Japan on Tuesday amid tight security, a week after a man killed a police officer and a school security guard with a knife and a gun and fired bullets at the school.Pupils came to Okuda Elementary School in the city of Toyama accompanied by family members after the school requested an escort for them, while teachers stood at nearby intersections and police officers patrolled the area."I am worried my son might have a flashback of the incident," said a 45-year-old woman, who walked her second-grader son to school."I am also worried about thre…READ FULL ARTICLE