An investigation was underway Thursday after a body was found at the scenic State Line Lookout in Bergen County, authorities said. Palisades Interstate Parkway police and members of the county’s rappel team were in Alpine to recover the body, officials said. No other information was immediately available, a police spokesman said. It was not clear if the body was found at the base of the Palisades Cliffs or elsewhere in the area. State Line Lookout is about a half mile south of the New Jersey-New York state line. Anthony G. Attrino may be reached at tattrino@njadvancemedia.com. Follow him on Tw…