Self-luminous UFO Filmed over the Aqueduct of Guadalupe, north of Mexico City, Mexico,
24 March 2004, Daytime

In this UFO TV report by Canal 28 one can see that the UFO is being filmed while several witnesses are watching the unknown object:

http://www.youtube.com/watch?v=SOFJmxJdiXs

Wikipedia article: “Acueducto de Guadalupe”:

http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fes.wikipedia.org%2Fwiki%2FAcueducto_de_Guadalupe&sl=es&tl=en&history_state0=&swap=1