West German Chancellor Helmut Kohl turned down an invitation by East German Communist Party leader Erich Honecker to attend a conference in East Berlin next month, a spokesman said.Honecker sent invitations to leaders of all major West German political parties to attend a conference in East Berlin June 20-22 to discuss East bloc proposals for setting up a nuclear weapons-free zone.

Kohl, who heads West Germany's Christian Democratic Union Party, decided not to attend, party spokesman Juergen Merschmeier told reporters in Bonn on Wednesday.