The Federal Bureau of Investigation’s Southern Maine Gang Task Force, and the Portland Police Department in Maine, are investigating the suspicious disappearance of Miguel Oliveras and are asking for the public’s assistance in locating him or his remains.  Oliveras, of Hyde Park, Massachusetts, was last seen around 1:00 a.m. on September 2, 2006, at the Platinum Plus Nightclub on Riverside Street in Portland, Maine.  At that time, he was wearing a gray camouflage long-sleeved shirt with…