DNA, fingerprint match: How FBI uncovered bomb suspect's ID

WASHINGTON — In the hours before his arrest, as federal authorities zeroed in and secretly accumulated evidence, Cesar Sayoc was in his element: spinning classic and Top 40 hits in a nightclub where he'd found work as a DJ.As he entertained patrons from a dimly lit booth overlooking a stage at the Ultra Gentlemen's Club, where Halloween decorations hung in anticipation of a costume party, he could not have known that investigators that very evening were capitalizing on his own mistakes to