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Nigeria's government has cautioned its citizens, in particular those with medical conditions, against travelling via Ethiopia's main airport due to its altitude. The foreign ministry in Abuja said 16 Nigerians with underlying health problems had died this year while transiting through Addis Ababa. The city sits at an altitude of 2,334m (7,657ft) above sea level, making it one of the highest capitals in the world. Bole International Airport is a major hub for travel between Africa, the Middle East and Asia, serving millions of passengers a year. Nigeria said those with cardiovascular and respiratory conditions were at an increased risk.
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