WASHINGTON (CNN) -- The Department of Homeland Security has tapped the nation's truckers to help find a man who has been seen taking photographs of tanker equipment. On three separate occasions, the man also asked truck drivers several questions about deliveries and operations, according to the Highway Information Sharing and Analysis Center. "The individual in question is also reported to have videotaped tank truck operations and deliveries as well as taken photographs of tanker equipment," states the "Be on the Lookout," or BOLO, alert. "Law enforcement has requested assistance in ascertaining the identity or whereabouts of the person in question."...