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.
Family of alleged Bondi gunman unaware of 'radical mindset', say Indian police
The alleged gunman shot dead by police during Sunday's attack on Australia's Bondi beach was originally from the southern Indian city of Hyderabad and his family did not know about his 'radical mindset', Indian police said on Tuesday.
Israeli forces kill Palestinian teen in West Bank, health ministry says
The Israeli military have shot dead a 16-year-old Palestinian during a raid on the town of Tuqu' on Monday, the Palestinian health ministry said, the latest deadly incident in a recent surge of violence in the Israeli-occupied West Bank.
Trump sues BBC for defamation, seeks up to $10 billion in damages
US President Donald Trump has sued the BBC on Monday for defamation over edited clips of a speech that made it appear he directed supporters to storm the US Capitol, opening an international front in his fight against media coverage he deems untrue or unfair.
FBI foils 'terror plot' targeting Los Angeles
Four people are facing criminal charges in connection with what Attorney General Pam Bondi described on Monday as a foiled bomb plot that contemplated multiple targets, including US immigration agents and their vehicles.
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