NOUAKCHOTT, Mauritania — The United States is expanding anti-terror efforts to the remote reaches of West Africa's Sahara borders, dispatching U.S. troops and contractors to help seal the predominantly Islamic region to al-Qaida and its allies. American officials gave The Associated Press details of the anti-terror program, and Mauritania officials confirmed to AP a massive explosives theft that illustrates why the West is concerned about the region. A U.S. anti-terror team arrived Saturday in the arid, Arab-dominated Islamic republic of Mauritania, U.S. Deputy Undersecretary of State Pamela Bridgewater told reporters late Sunday during a visit here. The small team will...