Details emerged Thursday of a foiled plot by two St. John, New Brunswick, teenagers to blow up their high school and kill teachers and students they disliked. The two boys, 16 and 17, were arrested Monday, and each have appeared separately in court, but details weren't disclosed until Thursday when the school principal and police called an assembly to explain what had happened. Police said the plot was uncovered when two other students overheard a conversation and told the school's principal, the Canadian Broadcasting Corp. reported. Police said the students had what appeared to be black gunpowder and a lead...