Ghazouani secured 56.12 percent of the vote, well ahead of his rival Biram Dah Abeid, says the electoral commission.
Mohamed Ould Abdel Aziz, questioned by police over suspected embezzlement, has been banned from leaving the capital.
At least 10 soldiers killed in the attack in the country's west, according to the Malian militaryâ??s Twitter account.
President Mohamed Ould Ghazouani names Mohamed Ould Bilal as prime minister after previous government resigns.
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At least 62 people died after their boat, which launched from the northern town of Barra in The Gambia, capsized.
Migranti, bilancio vittime tra i più alti quest'anno
At least 62 people, including children, drown while 83 others swam ashore after the overcrowded boat capsized.
Fears of a serious escalation increased after the arrest of the commander of the presidential guard and his deputy, both loyalists of former President Abdul Aziz.
Experts warn barren pastures in the two West African states threaten livestock herding, a key pillar of food security.