UFO Sighting in Philadelphia, Pennsylvania on April 29th 1997 – traveling along highway with mother and sister following ufo

I was little at the time picking up my sister from her house with my mother. On our way home we saw a cigar shaped object with black windows traveling just above a few large buildings along the highway. We all thought it was a ufo from the beginning and my mother tryed to follow it. After about ten minutes it went behind a building never to come out on the other side like it disappeared.