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Abroad, al Qaeda, its affiliates and other extremist groups have splintered and spread, seeking safe havens in undergoverned areas of Pakistan, Yemen, Somalia and places in North Africa and East Africa. That diversified threat has intensified as militants reach out to potential recruits through the Internet.

Assessing future threats, the report lists potential future domestic targets, including passenger jets, western or American hotel chains, Jewish or Israeli sites and U.S. troops, even at their own bases in America.

And it warns that it is no longer wise to think that American extremists will not resort to suicide bombings. As an example, they point to Army Maj. Nidal Malik Hasan, who has been charged with killing 13 people and wounding 32 in last year’s shootings at Fort Hood, saying he had written about suicide operations in e-mails, and that his attack appeared to be one.