Terrorist attack
The police and armed forces in South Africa announced on Friday that security would be reinforced this weekend following an alert launched by the US embassy in Pretoria last Wednesday.
The alert warned of a possible attack this Saturday in a suburb north of Johannesburg.
South Africa hosts four major events this weekend including the coronation of King MisuZulu Zulu in Durban, an event attended by President Cyril Ramaphosa.
Johannesburg hosts a gay pride event, there is also a rugby match in Pretoria and the football derby in Soweto.
Nigeria's capital, Abuja,is also under a security alert. Since Sunday that the embassies of the United States, Britain, Australia and Canada have been alerting to the "high" probability of an attack in the capital.
On Friday, the Nigerian government said it had beefed up security and called for the public to remain vigilant but calm.
Government troops are fighting jihadist insurgents mostly in the northeast, though there are small cells in other parts of the country.
Go to video
UK: Former Nigerian deputy senate president in court accused of organ harvesting
01:59
No fuel, no cash: conjunction of crises weigh on Nigerians ahead of Feb. 25 vote
Go to video
Jihadi violence intesifies in Burkina as militants kill nearly 30 in 2 days
Go to video
Nigeria suffers cash shortage as state gears towards cashless economy
Go to video
20 people dead after trucks crash into commuters in Nigeria's south
Go to video
US says its killed senior Islamic State member in raid on Somalia