Object over Tucson pursued by Air Force jets after entering local air space.Watching military jets taking off from Tucson International Airport when object came into view from extremely high in the western sky traveling to the southwest. One of the F15's made a quick bank toward the teardrop shaped extremely bright desending craft which didn't look like anything my friend or I have ever seen in the clear sky over this city. The object was gone as fast as it came well before the jet could turn to chase it. About 10 minutes after sighting the sky was full of military aircraft to the south of the city. We have a major Air Force base hear in Tucson, most of the aircraft came out of that base to search for whatever the unusual object was or where it went. I checked with our local tv news channel to see what they could add, they recieved many calls but could not get any answers from local sources. I've been a pilot flying in this area for many years as well as around the World and have never seen an object flying as fast and change directions as quickly.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))