Intelligence: Terrorists plan attack Intercepted al-Qaeda messages hint at strike that surpasses Sept. 11 05/19/2002 By JAMES RISEN and DAVID JOHNSTON / New York Times News Service WASHINGTON - American intelligence agencies have intercepted a vague yet troubling series of communications among al-Qaeda operatives over the last few months indicating that the terrorist organization is trying to carry out an operation as big as or bigger than the Sept. 11 attacks, intelligence and law enforcement officials say. But just as similar threats last summer left counterterrorism analysts guessing about al-Qaeda's intentions and led them to believe that the attack...