At least 21 teenagers, the youngest possibly just 13, died at the weekend after a night out at a township tavern in South Africa, in a tragedy whose cause remains unclear. The AFP news agency reports that many are thought to have been students celebrating the end of their high-school exams on Saturday night. There were no visible wounds on the bodies and officials have ruled out a stampede as a possible cause. To read more on this story visit the News Blog on the Future Media website.