Newsweek investigates the global reach of the terrorist network Al Qaeda, how its "cell" structure worked, how it laundered money and how its leader Osama bin Laden attempted to obtain weapons of mass destruction. The first part of the series, published in February 2001, predicts that the threat posed by bin Laden is growing. The second one, two weeks after the Sept. 11 terrorist attacks on the World Trade Center and the Pentagon, reveals details of a possible 20th hijacker involved in the tragedy. Some of the online stories examine possible links between the WTC suspects and USS Cole bombers, and reveal that FBI has identified more than 1,000 people with suspected terrorist ties inside the U.S. The series documents "numerous intelligence and policy failures that kept U.S. authorities from detecting the terror plot being hatched under their noses."