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The case against eight South African alleged mercenaries who appeared in the Pretoria regional court on Friday has been postponed to July 8.
The men are facing charges of contravening the Regulation of Foreign Military Assistance Act.
They were part of a group of 61 alleged mercenaries who returned to South Africa from Zimbabwe in May.
The men served a sentence in Chikurubi maximum security prison outside Harare after being convicted of violating Zimbabwe's immigration, aviation, firearms and security laws.
The charges were related to an alleged plot to overthrow the government of Equatorial Guinea.
The group's lawyer, Alwyn Griebenow, told reporters the National Prosecuting Authority had told him that there was not enough evidence to prosecute the rest of the group. - Sapa