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On Guard

Police asked company officials to be on guard for ``infiltration of your operation by individuals seeking employment, visitors to your facility who claim to be lost or appear disoriented, maintenance work that isn't announced or scheduled, deliveries that are not anticipated, people asking directions to sensitive areas,'' and other measures designed to ``discourage potential surveillance attempts.''

Police also instructed security personnel to check identification cards and insist that employees display them, and to have ready ``bomb threat checklists at all areas where employees may receive incoming calls.''

Companies should check their ``emergency generators, elevator recall operations and life safety systems,'' the police message said. Patrols should be ``conducted by uniformed security personnel at irregular times,'' including checking the building's roof, the advisory said.

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