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.
Trump denies offering Iran sanctions relief
US President Donald Trump said he has offered Iran nothing to end the war, rejecting media reports that cited US officials saying he was willing to ease sanctions and release frozen funds for "concrete" steps regarding Iran's nuclear programme.
At least 23 dead in Thailand floods, Bangkok airport in chaos
The death toll from rains and flooding in Thailand has risen to 23, authorities said on Tuesday, as waters receded from the hard-hit capital Bangkok, where its main airport operated in chaos, and the government approved a multi-million aid package.
SpaceX's Starship makes orbital debut but flight ends early
SpaceX's next-generation Starship rocket reached orbit for the first time on Monday despite having one of its engines shut down unexpectedly, overcoming a hitch mid-flight to deploy its first batch of new Starlink satellites in a truncated mission ending hours earlier than originally planned.
Red Bull wins India court reprieve to use 'energy drink' label
An Indian court on Tuesday quashed the food regulator's order to stop Austrian beverage firm Red Bull using the label "energy drink" on its cans, saying the decision had been taken without allowing the company to explain its position.
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