sentences:  The presence of the bomber in Greenland airspace in 1968 therefore triggered public suspicions and accusations that the policy was being violated.The nature of the "Hard Head" missions was suppressed at the time of the accident; the Danish and American governments instead claimed the bomber was not on a routine mission over Greenland and that it diverted there because of a one-off emergency.United States documents declassified in the 1990s contradicted the Danish government's position, and therefore resulted in a 1995 political scandal that the press dubbed "Thulegate".