Japanese police on Monday arrested a 56-year-old man in connection with two paring knives found at the school desk of Prince Hisahito, grandson of Emperor Akihito, local media reported. The incident comes as authorities were beefing up security ahead of the popular emperor's abdication on Tuesday after a 30-year reign, the first monarch to relinquish the throne of the world's oldest imperial family for two centuries. Akihito's eldest son, 59-year-old...