Criticism is growing after several top positions go to members of the president's ethnic Yoruba group.
An audit uncovers an alleged scam where applicants were required to pay more than the published fee.
The incident sparks outrage, with the opposition accusing the government of political intimidation.
Joseph Kabila is now in rebel-held Goma, according to the M23 armed group and a party official.
The highly unusual attack came after the ambassador reportedly raised concerns about the army chief.
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