The United States has ordered some diplomatic staff and their relatives to leave Nigeria’s capital, Abuja, citing the risk of terror attacks.
The American embassy in Abuja has advised US citizens not to travel to the city.
It hasn’t given any details of the potential threat.
On Wednesday the US made a similar warning for South Africa, saying people in Sandton – a wealthy neighbourhood in Johannesburg – should stay away from crowded areas this weekend.
President Cyril Ramaphosa said it was “unfortunate” that Washington hadn’t spoken to his government before making the announcement.