The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
We arrived home (along the susquehanna river in york county) around 7pm. we heard and witnessed a helicopter with a searchlight, hovering over and scanning the countryside and water. as we watched it, we became aware of four other aircraft flying at a higher altitude than the helicopter. as the chopper headed north, the craft flew in a pattern directly over our home. they were triangular in shape. possessed pulsating lights. their surface was black, but reflective. they flew northwest. entire encounter took four minutes.