The Phoenix Lights, sometimes referre to as "the Lights over Phoenix", is the popular name given to a series of optical phenomena and sightings that took place in the sky over the U.S. states of Arizona and Nevada, and the Mexican state of Sonora on March 13, 1997. A similar incident occurred April 21, 2008, although this incident was later reported to be a prank--flares attached to hot-air balloons. Lights of varying descriptions were seen by thousands of people between 19:30 and 22:30 MST, in a space of about 300 miles, from the Nevada line, through Phoenix, to the edge of Tucson. There were two distinct events involved in the incident: a triangular formation of lights seen to pass over the state, and a series of stationary lights seen in the Phoenix area. Although the United States Air Force (USAF) identified the second group of lights as flares dropped by A-10 Warthog aircraft which were on training exercises at the Barry Goldwater Range in southwest Arizona, some who observed the events believe differently. Notable among those who reported they had observed a huge carpenter's square-shaped UFO, having lights or light emitting engines, is Arizona Republican governor at the time of the incident, Fife Symington.