On 6-23-2012 at 10:30pm my partner and I saw approximately 15 UFOs cross through the night sky and disappear in cloud cover. We were in a NE facing room on the 2nd story of our house and suddenly saw 2 bright balls of light coming from under our line of sight (obscured by houses, trees, etc) and elevating higher into the sky as they traveled in an Easterly direction. We tried looking through binoculars to get a better idea of what we were looking at, but that ended up being fruitless as we were at a distance of 1-2 miles away, as they still just looked like balls of light. As soon as the first two disappeared into the cloud cover another two appeared from where the first had originated. That seemed to open the flood gates, as there were never less than 2 in the visible sky, and yet never more than 4. This went on for several minutes until finally one seemed to slow down and hover as it appeared to wait for what ended up being the last ball of light to make its way across the sky. We are in one of the flight paths of PDX, and routinely see planes and helicopters come and go. Of course we immediately thought they were planes, but that thought quickly left. If these were planes, they were unlike any we've ever seen. They were *bright* balls of yellow/white light (no blinking, no red or blue lights), completely silent, moved more methodically, were plentiful and in quick succession, and then of course there is the issue of the 2nd to last object stopping and hovering as it appeared to wait for the last object to catch up.