During the first week of February 1966, it became clear that Rhodesia continued to import oil by land from Portuguese Mozambique, and Prime Minister Wilson was warned that black African states could push for more urgent sanctions and raise the matter at the UN. On 24 February, the Chiefs of Staff Committee warned that tankers with oil for Rhodesia could arrive in the port of Beira, the terminus of a pipeline going to Rhodesia, unnoticed, and began preparing a maritime surveillance plan for submission to the Prime Minister. Later in February, the British government and world press began focusing on tankers carrying oil for Rhodesia when on 25 February, the Rhodesian Commerce and Industry Minister announced that a tanker with oil for Rhodesia would soon arrive.