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Here are today's top stories from VOA Africa:

US Closes Facilities in S. Africa Over Security Concerns Embassy spokeswoman tells reporters facilities were closed following report from regional security office in Pretoria; no further details provided Al-Shabab Pledges Loyalty to Bin Laden Video appears to be response to al-Qaida leader's audio message in March, in which Osama bin Laden urged Somalis to overthrow President Sheikh Sharif Sheikh Ahmed HIV/AIDS Presents New and Different Threats, says report Study released at The Hague examines security threats Using Development to Alleviate Poverty US Millennium Challenge Corporation says UN session looks at partnership programs Tribunal Receives Rwandan Genocide Suspect from DRC Spokesperson for International Criminal Tribunal for Rwanda says Gregoire Ndahimana is being held by Tanzanian-based court Obama: US Determined to Act on Climate Change President tells special UN summit on climate change US understands gravity of problem Obama Lunches With African Leaders at UN US ambassador says meeting will focus on how Washington can work in partnership with African governments to strengthen Africa's economic, social development Drought, Global Financial Crisis Signal Hunger Alert, Budget Shortfall in Kenya UN agency to press world donors, G20 leaders to make good on $277 million in food aid pledges G20 to Discuss Future of Economic Stimulus Finance ministers, central bank leaders to discuss winding down government-led rescue measures