Official urges countries that have issued unilateral travel restrictions to revoke them.
Serving as chief of staff to the President at the time of his arrest, Mr Kamerhe became the most senior politician to face trial for graft in DRC.
Amnesty provides for the voluntary surrender of illegal weapons on condition of anonymity and immunity from prosecution.
Weeks ago, Germany, the UK, US and Turkey urged their nationals to leave Ethiopia, and Zambia airlifted its citizens.
Polls team says procedure was not followed in the election of the two representatives.