04/15/73 Glenolden Pa. large brownish gray craft in the sky wittnessed by many

It was on or about april 15th 1973 I remember because it was right before easter I was 10 yrs old at the time. I was traveling in the family station wagon with my mother and 12 year old sister. We were headed home from shopping traveling south on south ave in the small town of Glenolden pa. as we approached the area of the Macdade Mall we could see the traffic was stopped up a head. Then we noticed that people were out of their cars looking up at the sky.As we looked up there was a giant craft of some kind, I mean this thing was huge as big as the mall and the parking lot all put together. There were a few white lights on the center of the under side and the craft made no sound at all. It just seemed to hoover there in the sky.The craft was an oval shape brownist gray in color. there many witnesses to this event. We watched it for about five minutes then continued home. After arriving we called our local radio station to report what we had saw, they were receiving many reports of the same object in the sky.That night it was all over the local news. And by the next day it seemed, it was completley forgotten about and never mentioned again, there was no explanation ever given for what we saw in the sky that night. to this day my sister and wonder what it was that we saw.
Source of report indicates that the date of the incident is approximate.  PD