For those who may not have heard yet, the space shuttle Columbia, with 7 astronauts on board, broke up on re-entry from its 16 day science mission. It is unlikely there were any survivors. Long range photographs of the re-entry show clear evidence of a breakup, and witnesses near Nacogdoches and Palestine, Texas, have reported falling debris. Given the altitude and speed of the vehicle at breakup, it is believed unlikely to be a terrorist act.
Our thoughts and prayers are with the families of the crew.