Rebels pressing hard to end Mobutu Sese Seko’s 32-year dictatorship have warned foreigners to leave the capital. And U.S. troops across the border in Congo are ready should evacuations be needed. The rebels have given Mobutu until Sunday to leave office and have threatened to bring their fight to the capital Kinshasa if he doesn’t. They already control more than a third of the country, mostly in the east, and have encountered little resistance in their quest to topple the president.