I had originally posted this on the main page of paratracker.org.. but doing updates, I decided to move it to this area. There have been many interviews on this particular sighting and it is now believed to be a hoax..

Here is also an article from abc15.com:

Unexplained Lights - Were They Flares??

PHOENIX -- Strange lights appeared above the Valley sky in formation on Monday night. Witnesses said the lights formed a vertical line, then a diamond shape, followed by a u-shape.The lights reportedly moved from side to side and upward before disappearing one by one. ABC 15's Christopher Sign learned the largest UFO investigative group is now investigating the incident. The Mutual UFO Network, known as MUFON has more than 6,000 field investigators worldwide who investigate reported UFO sightings. "There's a number of things those lights could be," said MUFON investigator Jim Mann.

Mann and another investigator in Mesa say they will begin talking to witnesses and gather detailed information from what they saw. "I always try to debunk sightings and I can't debunk it, then I know I've got something on my hands," said Mann. MUFON investigations can last a matter of minutes to several weeks. Mann says he and fellow investigator, Stacey Wright, are currently looking into several other UFO sightings across the valley that have all taken place in the daylight hours.

ABC15's Jon DuPre talked to one north Phoenix man late Tuesday afternoon who said he watched his neighbor launch four helium balloons with flares attached to them right before the mysterious lights were spotted. He said he believed this could be the source of Monday night's sightings. ABC15 knocked on the door and talked to that neighbor, who then said he didn't launch the flares, and instead it was another neighbor several doors down.

A Phoenix police helicopter pilot also witnessed the lights and described them as resembling flares. FAA officials told ABC15 on Tuesday that air traffic controllers in the Sky Harbor tower saw the lights, but noticed nothing on their radar, meaning it was not an aircraft.An official with the North American Aerospace Defense Command (NORAD) said they checked with their command center that monitors the skies to see what is entering the Earth's atmosphere. They have no reports of anything entering the Phoenix area.

Full article: http://www.abc15.com/news/local/story........