NEW : Gadhafi 's son says he is willing to negotiate a cease-fire . The Associated Press contributed to this report. `` No comment '' on a report that the NTC knows Gadhafi 's whereabouts . Libya 's new leaders have given Gadhafi loyalists until Saturday to surrender .
NEW : Gadhafi 's son says he is willing to negotiate a cease-fire . `` As far as we are concerned , negotiations are over , '' NTC negotiator says . `` No comment '' on a report that the NTC knows Gadhafi 's whereabouts . Libya 's new leaders have given Gadhafi loyalists until Saturday to surrender .