JOHANNESBURG — Although the Chinese ship that was carrying arms to Zimbabwe, the An Yue Jiang, has reportedly turned back, we don't know where else President Robert Mugabe's military and paramilitary forces may be acquiring weapons.

In light of the escalating violent repression of the opposition Movement for Democratic Change — and of those whose support apparently helped the MDC to prevail in the presidential election, the results of which have still not been announced after four weeks — an international arms embargo on Zimbabwe is urgently needed.

In addition, we call on the African Union, with the support of the United Nations, to send an investigative mission to Zimbabwe to determine what additional measures may be required to carry out the internationally accepted "responsibility to protect."