An ambush that killed four U.S. special forces soldiers in Niger recently drew attention to the deteriorating security situation in parts of the Sahel region of sub-Saharan Africa. Mariama Diallo reports on the efforts by the group of 5 Sahel nations (Burkina Faso, Mali, Mauritania, Niger and Chad) to establish a joint military force to tackle terrorism threats in the region as representatives visit the United States this week to make their case.
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