An investigation of this flash has so far turned up only the fact that it appeared near a sewage treatment plant. No explosions or unusual events were recorded at the plant, however. As of March 12, 2012, the flash remains a mystery. We will revist if an explanation is ever found.

http://www.youtube.com/watch?v=33wST0WHuvM
Story Source:
http://www.examiner.com/unexplained-phenomena-in-national/was-the-bright-flash-of-light-televised-by-a-local-phoenix-station-a-ufo-video
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