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Here are today's top stories from VOA Africa:

US Closures in South Africa Prompted by al-Qaida Linked Threat 'Pretoria News' says group telephoned embassy Monday and apparently gave detailed information about possible attacks against several US government buildings US Targets Senior Kenyan Officials for Impeding Reforms Warning letters, travel bans meant to push forward police, judicial, electoral overhaul Researchers: AIDS Vaccine Cuts Infection for First Time US, Thai officials say experimental vaccine lowers risk of HIV infection by almost a third Advocacy Groups Praise AIDS Vaccine Trial Results Thailand clinic trials demonstrate vaccine can prevent HIV infection DR Congo Rebels Suspend Involvement in Peace Agreement Civil war ended in 2003 but militias have remained active in eastern areas Military Supporters in Guinea Reject African Union Sanctions AU says it will impose sanction if country's military ruler Captain Moussa Camara decides to run for president Obama to General Assembly: Work for Peace in Sudan UN remarks reflect White House cognizance of citizen groups' mobilization over Darfur genocide North, South Sudan in War of Words over Tribal Attacks UN estimates string of attacks in region has left more than 1,200 dead since beginning of year Libyan Leader Moammar Gadhafi Pitches His Tent on Trump Property Local leaders in a town north of New York City insisted the tent come down and got their way Ghanaians Reflect on Legacy of Kwame Nkrumah Ghana is marking 100th anniversary of birth of its first president, Kwame Nkrumah, who championed independence from British rule and promoted liberation and unification of entire African continent Drip Irrigation Boosts Food Production in West Africa Farmers in the Senegal implements slow-pressure method of irrigation that is already in use in Niger, Burkina Faso, Ghana, and Benin WHO: Only 3 Billion Swine Flu Vaccines This Year Organization says single dose of vaccine will be sufficient for healthy adults and older children, but will be inadequate to cover world's 6.8 billion people