FBI agents interrogating captured al-Qaeda operatives now suspect there was a plan to hijack a fifth jet on 11 September to attack the White House. Debriefings with Khalid Shaikh Mohammed, the alleged mastermind of the terror plot, and its suspected chief financier, Mustafa al-Hawsawi, have led to the new theory. "Many, many people are saying many interesting things," a senior FBI official was reported as saying. The interviews are being conducted as part of the probe into alleged 20th hijacker, Zacarias Moussaoui. Court papers from defence lawyers and a United States district judge show that prosecutors in the case are...