At least 100 people have died in an Ebola outbreak in the Democratic Republic of Congo, with more than 390 cases suspected, the head of Africa CDC told the BBC. The WHO has declared the outbreak an international emergency. The current strain is caused by the Bundibugyo virus, for which there are no approved drugs or vaccines. Two cases and one death have also been confirmed in Uganda.

At least six Americans have been exposed to Ebola during the outbreak, sources told CBS News. One is believed to have symptoms, while three others faced high-risk exposure. The CDC is supporting the "safe withdrawal" of a small number of Americans, who could be taken to a US military base in Germany. The US has issued a Level Four travel advisory - its most severe warning - for DR Congo.

While the CDC says the risk to the US remains relatively low, it's implementing measures including monitoring travelers from affected areas and restricting entry for non-US passport holders who have been in DR Congo, Uganda, or South Sudan in the past 21 days. The WHO warns this could become a much larger outbreak than currently detected, with significant risk of regional spread. The 2014-2016 West African Ebola epidemic infected more than 28,600 people and killed 11,325 across multiple countries.