The Mauritanian authorities cut access to mobile internet services early Tuesday after protests took place the previous evening in several cities against presidential election results.
Protesters took to the streets on Monday evening in the capital Nouakchott, as well as the coastal city of Nouadhibou, Zouérat in the north and Rosso in the south-west.
President Mohamed Ould Ghazouani was re-elected after winning 56.12% of votes cast during Saturday's elections.
His main rival, Biram Dah Abeid, an anti-slavery human rights activist, came in second place after winning 22% of the vote.
Abeid rejected the results and alleged there was fraud, and urged his supporters to protest against the results.
After the results were officially announced on Monday, Ould Ghazouani, 67, said that his victory reflects the success of the democratic process in the north-west African nation and vowed to continue consultation and dialogue with all political parties.
Ould Ghazouani, a former defence minister, was elected in 2019 in the country's first peaceful transition of power.
His predecessor Mohamed Ould Abdel-Aziz took office after a 2008 military coup.
Earlier this year, the European Union promised Mauritania, a former French colony, financial support worth €210 million ($229 million), to be used to tackle migration and provide humanitarian aid for migrants.
