SALOU, Spain (AP) — A few months before Sept. 11, several al-Qaida operatives slipped into this Spanish beachside resort, blending in with the tourist crowds to hold what investigators increasingly suspect was a pivotal rendezvous in planning the terrorist plot. A senior Spanish official with extensive knowledge of the investigation said authorities now believe the mid-July gathering was the last face-to-face encounter between hijack ringleader Mohammed Atta and his al-Qaida liaisons in Europe. The main details of the conspiracy to crash commercial jets into the World Trade Center and the Pentagon were largely in place by the time the meetings...