BOSTON -- Four "hoax devices" were found at several Boston locations Wednesday, hours after officials detonated a suspicious package on an elevated structure above the Sullivan Square Massachusetts Bay Transportation Authority station. The additional packages were found at the Boston University Bridge, the Longfellow Bridge and near the intersection of Stuart and Columbus streets. A device described by officials as a pipe bomb was found in the basement of the Tufts New England Medical Center at 185 Harrison Ave. A spokesman for the Boston Police Department said that all of the packages appeared to be similar. "Our device was not...