An outbreak of yellow fever has killed 21 people in the Democratic Republic of Congo, the World Health Organization (WHO) says, linking some cases to an outbreak in neighbouring Angola.
There was, it said, a "serious risk of further spread of the disease" in DRC.
The acute, mosquito-borne viral disease has killed 225 people in Angola and infected about 1,600 there.
The WHO said the DRC health authorities had set up a national committee to respond to the outbreak, including "screening and sanitary controls" on the country's borders.
It is endemic in tropical regions of Africa and South America.