The police organization's behavioral profile says such a person might exhibit "multiple anomalies," including wearing a heavy coat or jacket in warm weather or carrying a briefcase, duffel bag or backpack with protrusions or visible wires. The person might display nervousness, an unwillingness to make eye contact or excessive sweating. There might be chemical burns on the clothing or stains on the hands. The person might mumble prayers or be "pacing back and forth in front of a venue."
(courtesy of your Friendly Neighborhood Bruce Schneier)
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