Officials in Guinea say a team of health workers and journalists who were trying to raise awareness about Ebola may have been kidnapped.
The team of six went missing after being attacked on Tuesday in a village near the southern city of Nzerekore.
Reports say a Guinean delegation to find them, led by the health minister, has been unable to reach the village after a nearby bridge was destroyed.
More than 2,600 people have now died from the Ebola outbreak in West Africa.
It is the world’s worst outbreak of the deadly disease, with officials warning that more than 20,000 people could ultimately be infected.
The UN Security Council is due to discuss the outbreak later on Thursday.
Last month, riots erupted in the area of Guinea where the health team went missing – near where the outbreak was first recorded – after rumours that medics who were disinfecting a market were contaminating people.
The three doctors and three journalists went missing on Tuesday after residents in the village of Wamey pelted them with stones as they visited the village.
One of the journalists managed to escape and told reporters that she could hear the villagers looking for them while she was hiding.