Africa News Tonight: US presidential contenders square off, no progress on Sudan cease-fire, crime damages Lake Victoria ecosystem

Vice President Kamala Harris and former President Donald Trump square off Tuesday in Philadelphia for their first presidential debate. As the death toll in Sudan's war rises to more than 20,000 people, United Nations-backed human rights investigators call for the creation of an “independent and impartial force” to protect civilians. Several agencies say Lake Victoria, the largest lake in Africa, has become a convergence point for organized crime seeking to exploit the fragile ecosystem.