Fast flying triangle shaped object with blinking lights over South Phoenix, and Tempe AZ

In the western sky over Tempe, AZ, this object appeared to fly back and forth at a rapid rate of speed, mostly over South Mountain, where the TV and radio station towers are located. It was white, appearing to blink to shades of red and orange....visible contrails were seen, first appearing as pencil thin lines.....radiating out into wide "smoke trails"....widening by the minute until they dissipated. Object was seen to disappear to the north....reappearing again to the south of South Mountain. White lights seemed to blink fairly constantly....like strobes.
Because of both the location, and nature, of the bright objects, we strongly suspect that the bright objects may have been aerial flares, launched from aircraft over the Barry M. Goldwater Firing Range, located near Gila Bend, AZ.  That is what official military sources apparently reported, shortly after the event had occurred, and we have no reason to doubt that claim.  PD