NEW : Authorities finished searching 18 `` spots of interest '' in Long Island , New York on Thursday . NEW : Their search did not uncover additional evidence in their investigation of a possible serial killer . New York ( CNN ) -- Police and FBI agents finished searching 18 `` spots of interest '' in Long Island , New York on Thursday without uncovering additional evidence in their investigation of a possible serial killer . A helicopter has been hovering over the Tobay Beach area since morning . Comment:
NEW : Authorities finished searching 18 `` spots of interest '' in Long Island , New York on Thursday . NEW : Their search did not uncover additional evidence in their investigation of a possible serial killer . A helicopter has been hovering over the Tobay Beach area since morning . Comment: