The administration of President William J. Clinton subsequently worked to isolate Sudan. During the mid-1990s, it instituted a Front Line States policy of pressure against Khartoum with the assistance of Uganda, Ethiopia, and Eritrea. Growing unhappiness over Sudan's policies and terrorist threat information aimed at Americans in Sudan, much of which turned out to be false, caused the United States in the spring of 1996 to relocate all Americans from the embassy in Khartoum to the U.S. Embassy in Nairobi. The embassy in Khartoum remained open but staffed by Sudanese and occasional Americans visiting from Kenya. At the urging of the United States, Sudan forced Osama bin Laden to leave the country in May 1996, but Washington did not follow this development by trying to improve ties with Sudan. The low point in relations occurred in August 1998, just days after the bombing of the American embassies in Dar es Salaam, Tanzania, and Nairobi, Kenya, when a U.S. naval vessel launched cruise missiles against a pharmaceutical factory in Khartoum on the questionable grounds that it was linked to the production of chemical weapons.