Timothy Pitzen, 6 Missing

Police come up empty in massive search for Aurora boyAurora police and officers from other agencies are searching areas in and around Sterling for clues to the whereabouts of a missing 6-year-old Aurora boy Timothy Pitzen on Thursday, May 19, 2011.FBI, U.S. marshal join hunt for missing Aurora boyCops: Missing boy’s backpack, car seat also goneMissing boy’s classmates tying yellow ribbon around