Two unexplained flying amber lights move apart and regroup over downtown Wilmington, NC.

At approximately 22:15 on Sunday, March 6, 2016, three witness observed a low, slow moving unidentifiable object crossing the Cape Fear River over downtown Wilmington, NC.
What was observed was two spherical amber lights moving along the river.  The object than made a curved turn.  The lights were then observed to move an equal distance apart briefly before returning to their original position.
Absent from this event was any form of noise that would explain if this was a possible aircraft.  The lights moved apart and back in formation several times before completely disappearing from view.
This event, upon investigation, closely matches a similar event that occurred in December of 2012 in another part of North Carolina.
Their are no concrete details to report as to size and shape as all that could be seen were the very distinct lights.  An estimated guess would place them approximately 250 feet in the air moving at a speed of less than 80mph.