Jan. 2006:66//29

Oct. 2005:67//31

July 2005:60//27

July 2004:71//25

Aug. 2003:75//23

Nov. 2002:69//27

June 2002:76//20

Nov. 2001:81//14

Oct. 2001:84//13

Oct. 2001:88//8

Source: Pew Research Center

Percentage of people who think it "very likely" that there will be another terrorist attack in the United States within the next few months.

Sept. 2001:36

Oct. 2001:46

Dec. 2001:23

Jan. 2002:18

Feb. 2002:18

April 2002:21

May 2002:25

July 2002:27