Large triangular space craft sighted above North Senior High School' football field, in North St. Paul, MN in early October 1, 1973

My girlfriend and I were driving on the local highway that runs through the middle of our town, North St. Paul, MN, and were just coming near the high school's football field.  Very obvious in the sky, just hovering over the football field was a large triangular spacecraft, at least as big as the field.  It did not make any obvious sounds, but we were ina car on the highway,  so that presents noise of its own.  However, above that normal highway noise, there was nothing unusual.  There were lights on each of the triangle tips.  We stared in awe as we continued on the highway.  Though I wanted to go to my house for a camera to take a photo, my friend was afraid to return to the spot.  We did go to a nearby corner store and called police to report it.  No one took us seriously at either the store or the police.  We did not return to that location again that night.  There were no reports in the paper about the sighting, though it seems apparent that others must have seen it also.
Date is approximate.  One of two credible reports from same source.  PD