Mauritanians are voting for the first time since the country gained independence from France in 1960.
The 62-year-old is standing down after serving the maximum two five-year elected terms.
However the status quo is likely to prevail when a new leader is elected.
Abdel Aziz has expressed his support for Mohamed Ould Ghazouani, who is a former general and defense minister.
Iraq investigates attack on military base
A huge blast at a military base in Iraq early on Saturday killed a member of an Iraqi security force.
Man dies after setting self on fire outside Trump trial courthouse
A man has died after setting himself on fire on Friday outside the New York courthouse where Donald Trump's historic hush-money trial was taking place as jury selection wrapped up.
India begins voting in election as Modi seeks historic third term
India began voting on Friday in the world's largest election as Prime Minister Narendra Modi seeks a historic third term in office on the back of growth, welfare, his personal popularity and Hindu nationalism.
Teenager charged with terrorism over Sydney bishop stabbing
A 16-year-old boy has been charged with a terrorism offence for allegedly stabbing an Assyrian church bishop in Sydney during a church service, Australian police said on Friday, as investigations continued into a riot after the knife attack.
Kenya's military chief among 10 killed in helicopter crash
Kenya's military chief, General Francis Ogolla, was among 10 people killed when their military helicopter crashed shortly after take-off on Thursday.
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