The African National Congress, ending a historic conference marked by criticism of Nelson Mandela and the movement's other aging leaders, threatened Sunday to suspend talks with Pretoria unless it meets its racial reform obligations by April 30.

In resolutions disclosed on the final day of the three-day national meeting, the ANC affirmed negotiations with the white minority government and the suspension of the ANC's guerrilla war, but warned, "Our patience with this regime is running out."