Steve - I can't see how it would be possible for a terrorist to have any involvment in this. The shuttle was flying at 12 thousand miles per hour when it exploded and there is nothing remotely available to a terrorist that could intercept that.
There was mentioned two weeks ago that when the Columbia lifted off from the Kennedy Space Center that a tile or panel had impacted a wing causing some damage but they thought it would not be an issue. There are potential hundreds or thousands of other possibilities too, from a bad valve to damage from debri in space. But a terrorist even is very unlikely.
SSX - it broke up 40 miles up and the parts have scattered from Texas thru Louisiana. They are finding debri over a very large area. All the parts of any weight that were up there should be down by now.
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