Nigeria has issued a travel advisory urging citizens with underlying health conditions to exercise caution when travelling through Ethiopia's capital, Addis Ababa, after 16 Nigerians reportedly died there this year while in transit.
According to Nigeria's Ministry of Foreign Affairs, the deaths were linked to health complications associated with the city's high altitude. Addis Ababa sits about 2,355 metres above sea level, where lower oxygen levels can pose challenges for people with cardiovascular, respiratory and other chronic medical conditions.