WASHINGTON, Sept. 30 (UPI) -- Wall Street Journal reporter Daniel Pearl was investigating the man who allegedly planned the Sept. 11 airplane hijackings and attacks on New York and Washington when he was kidnapped and murdered in Pakistan, according to two former Central Intelligence Agency officials. Bob Baer, a former case officer in the agency's Directorate of Operations, said he provided Pearl with unpublished information about Khalid Shaikh Mohammed, who has since been accused by American officials of being one of the masterminds of the Sept. 11 terrorist attacks and a top aide to Osama bin Laden. Mohammed is...