We know. for example. that at least two of the 9/11 hijackers used passports that were altered when they entered this country and as many as 15 of the 19 hijackers could have been intercepted by border officials. based in part on their travel documents. The 9/11 Commission Report detailed the way the terrorist operatives carefully selected the documents they used January 11. 2007 CONGRE for travelmost often relying on fraudulent ones. The terrorists altered passports by substituting photographs. adding false visas. bleaching stamps. and by substituting pages. The terrorists devoted extensive resources to acquiring and manipulating passportsall to avoid detection of their nefarious activities and objectives. Today. over five years later.