triangular ufo with red, blue.green,lights

Reports on wmlp fm radio said their was a sighting in milton of a ufo . I had some friends who worked in a garage across the river in montandon Pa. and started walking over the bridge to see if they had heard the report on the radio . It was somewhat foggy on the river .I was three forths accross the bridge when I looked north up river towards milton when i saw what I thought was a large boat drifting toward the railroad bridge in front of the bridge I was on and I thought to yell at it because It was going to hit the bridge ! There was no sound , I noticed as it got closer that tis object was lighted with red, green and blue pulsating lights and that they formed a triangle ,I remember thinking of how this reminded me of an outline of a Christmas tree. Just as I was going to yell at this craft to prevent it from hitting the bridge I noticed a fire develope from the bottom of it , a deep orange fire . It then shot off , straight up into the sky. I watched it ascend and noticed that there was a small plane also heading south high up and I thought that it would be hit by this ufo but it flew right by the plane and the plane did not even seem to see it ? I asked my friends at the garage if they had seen it and they said no.
Date is approximate.  PD