A new Ebola outbreak has been declared in the Democratic Republic of Congo, one year after the end of the epidemic in West Africa that killed 11,000 people.
The World Health Organisation (WHO) confirmed two cases of the deadly virus in the east African nation and is investigating another 17 suspected cases.
Three deaths have so far been reported and six patients have been hospitalised.
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In a statement, the DRC health ministry said: "Our country must confront an outbreak of the Ebola virus that constitutes a public health crisis of international significance."
Health minister Oly Ilunga told the Congolese "not to panic" despite this being a "national health emergency with international significance".
He added that the "authorities have taken all necessary measures to respond quickly and efficiently to this new outbreak".
Over the weekend, Dr Matshidiso Moeti, WHO's regional director for Africa, travelled to the capital Kinshasa to discuss the response plan with leading authorities in the country, while Gavi, the global vaccine alliance, confirmed 300,000 vaccines for the disease were available in case of an outbreak on the scale of the 2014-16 epidemic.
BBC global health correspondent Tulip Mazumdar said the outbreak was "extremely worrying" for communities living in affected regions, but added that the DRC "has stamped out more Ebola outbreaks than any other place on earth".
There have been eight Ebola outbreaks since 1976, she adds, with the last one, in 2014, being brought to an end within four months.
How the latest outbreak has developed is unclear, but previous ones have been blamed on civilians coming into contact with infected "bush meat" such as apes, says The Independent.
In January 2016, WHO declared the end of a two-year Ebola epidemic across Liberia, Sierra Leone and Guinea that led to 28,000 people being infected with the virus.
