Envoys see N Korea mystery site The diplomats were allowed to photograph the site Foreign diplomats have visited a large construction site in North Korea which Pyongyang said was the cause of a mysterious cloud last week. The diplomats were told a hydroelectric dam was being built and the cloud was due to explosions to clear the area. But South Korea stoked confusion on Friday when it said the diplomats were taken to a place well to the east of the originally suspected location. Seoul also said it now believed the cloud was not caused by an explosion. MYSTERY...