A new case of Ebola has been found in Liberia, a country declared free of the disease on Sept. 3, a senior United Nations official said on Friday.

The patient is a 10-year-old boy who lived in the Paynesville, a suburb east of the capital Monrovia, said the official, who declined to be named.

The case represents a setback for Liberia, which has seen more than 10,600 cases and 4,808 Ebola deaths since it was first announced in March, 2014, according to U.N. World Health Organization figures.

The virus has killed about 11,300 people in Guinea, Sierra Leone and Liberia, but Sierra Leone was declared free of the virus on Nov. 7 and Guinea has begun its countdown to the end of the virus.