A sign shows a man looking at a bag on the floor in an anti-terrorism billboard in a Bay Area Rapid Transit (BART) metro station in San Francisco, California June 22, 2004. BART will be installing more than 150 billboards throughout the bay area stations as part of an anti-terrorism awareness campaign designed to put passengers on alert for unattended and suspicious bags as well as suspicious behavior. REUTERS/Kimberly White KW