A 15-year-old boy has died of Ebola in Liberia, which was previously declared free of the virus.
The boy's father and brother have also tested positive for the virus and have been taken to a treatment centre along with his mother and two other siblings.
Health officials have identified nearly 160 people who might be at risk of the disease, including 10 healthcare workers who came into direct contact with the boy.
The source of the virus is being investigated but it is the first death in Liberia since July.
Liberia has recorded more than 4,800 Ebola deaths and more than 10,600 cases since this year's outbreak.
It was first declared Ebola-free on May 9, but new cases emerged in June resulting in two deaths.
The World Health Organization declared the country Ebola-free again on September 3.