North Korea has cancelled the Pyongyang marathon for unspecified reasons, a tour agency linked to the event has said. British-owned Koryo Tours, which describes itself as the official partner of the marathon, said on Monday that it had received notice of the cancellation from North Korea's athletics association. A message it attributed to the association said the marathon was being cancelled "due to some reasons". The annual event was established in 1981 to celebrate the birth of North Korea's