KAMPALA, Uganda (AP) — Uganda’s electoral commission says longtime President Yoweri Museveni has won a sixth term, while top opposition challenger Bobi Wine alleges rigging and officials struggle to explain how polling results were compiled amid an internet blackout. In a generational clash widely watched across the African continent, the young singer-turned-lawmaker Wine posed arguably the greatest challenge yet to Museveni. He had strong support in urban centers where frustration with unemployment and corruption is high. The top United States diplomat to Africa has called the electoral process “fundamentally flawed.” Thursday’s vote followed the East African country’s worst pre-election violence since Museveni took office in 1986.