Bluish object looked like a tracer bullet from WW2 footage, and then burst into flames as it moved across the sky to the north.At approximately 7:20 pm PST (same as Arizona time), before sundown I saw a large bluish object roughly the size of a 1/8 object held on an outstretched arm. It appeared similar to a tracer bullet from WW2 war footage. It moved across the sky directly overhead and terminated to the north. It sort of "hung in the air" for approximately 3-4 seconds. As it approached the Catalina Mountains to the north the object burst into an orange flame for the last ½ second of flight before disappearing behind the mountains. This occurred in Tucson, AZ while I was driving due east and looking approx. or within a few degrees of due north. Object appeared to be falling from the sky, but may have been traveling across the sky.