"Out of an abundance of caution, and in light of newly discovered information, the FBI cannot rule out additional subjects, targets, or the potential for inspired copy cats who might act out in support of the original act," the intelligence assessment said.
Muslim-convert Abdulhakim Muhammed has pleaded not guilty to Monday's deadly shooting in a suburban Little Rock shopping center where Pvt. William Long, 23 was killed and Pvt. Quinton I. Ezeagwula, 18, was wounded.
Authorities said Muhammed targeted soldiers "because of what they had done to Muslims in the past."
Muhammad is currently charged in state court, but FBI spokesman Richard Kolko said Wednesday that the bureau is also investigating, "which may result in additional federal charges and prosecution."
Long and Ezeagwula both completed basic training within the past two weeks and had never seen combat. They volunteered to help attract others into military service, and were shot as they smoked cigarettes outside the recruiting center.
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Associated Press writer Devlin Barrett contributed to this story.
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