It is staffed by linguists, terrorism analysts, and professional interrogators, and supplemented by other government specialists.

This problem also plagued the terrorism analysts as they examined Iraq's links to terrorists.

A senior terrorism analyst for the federal government said American truckers needed to be alert to the heightened risk.

Mr. Bergen, CNN's terrorism analyst, is not the narrator but the primary talking head.

What is most striking about the messages is their tone, terrorism analysts say.

Until mid-2002, he was one of Australia's most senior terrorism analysts, primarily assessing and reporting on terrorist groups in Asia.

In 2003, American terrorism analyst, Evan Kohlman, said in an interview:

Rita Katz, a terrorism analyst, called the indictments a breakthrough by targeting a group other than Al Qaeda.

Some scientists and terrorism analysts argue that there is little reason to believe that terrorists would attack American agriculture or livestock.

"A terrorist can focus on landmarks," says Bruce Hoffman, a terrorism analyst for the Rand Corporation.