This event occurred on March 13th, 1997…….an excellent report on this can be found on NUFORC.org.
For various videos please see below:
Phoenix Lights UFO – Former Gov.Fife Symington says he saw it
Why ‘Phoenix Lights’ UFO are not military flares
UFOs over Phoenix , Arizona
UFO – Phoenix Lights; full version
Phoenix UFO confirmed: George Noory interviews former Governor of Arizona (actually audio but interesting)
Former Arizona Governor admits he saw Phoenix Lights UFO (March 2007)
Also a very informative article entitled:
ADDENDUM TO THE REPORT ON PHOENIX LIGHT ARRAYS
by Bruce Maccabee, originally posted Sept. 30, 1998; updated to March, 2002 can be seen here ….in which he believes they were flares?
one large article against flares and other usual suspects (ie swamp gas, meteors,ect) being the cause, is steve Lantz in “The Pheonix Lights…. Debunking the Debunkers“.