EIDELBERG, Germany, Sept. 7 — Neighbors and co-workers describe Astrid Eyzaguirre as a chatty, vivacious woman who bounced through several jobs at the military shopping center in this romantic university town where the European headquarters of the United States Army is based. It may have been her chattiness that led Ms. Eyzaguirre to warn a colleague at the liquor store where she worked not to come in next Wednesday, Sept. 11. Something bad, she said, was going to happen that day.Her colleague reported the remark to the military police, according to several people who work at the shopping center,...