https://catalog.archives.gov/id/28977850 Jutland, Denmark, April 1958 Witnesses: multiple Big black low flying object described as a spaceship by woman observer. White and yellow circle on spaceship which seemed to move and as it flew over, there were horseshoes shapes lights emitting strong lights. At another location about 20 witnesses saw triangular shaped object at the same time. One of these described it as a sea of flames.