Authorities in Liberia, Mali, Senegal, Sierra Leone, Ivory Coast, and Guinea-Bissau are warning of an Ebola outbreak after three people died as a result of the disease in neighboring Guinea.
Liberian President George Weah has ordered his country's authorities to step up security.
A statement from his office said: "The government is taking all necessary steps to ensure the safety of our citizens."
Sierra Leonean President Julius Maada Bio has instructed his country's health ministry to "take strict measures to prevent the disease from entering the country and to take measures to protect the lives of Sierra Leoneans".
The Ebola outbreak in West Africa between 2013 and 2016 - which first broke out in Guinea and killed at least 11,000 people.
The Democratic Republic of Congo is currently experiencing the 12th outbreak of the disease. Four cases have been reported in the east of the country so far.
Source: Naija News