President Alassane Ouattara, 83, was on Monday sworn in for a fourth term as leader of Côte d'Ivoire, after elections in which his two main opponents were excluded from the ballot.

Ouattara was reelected with nearly 90 percent of the vote in the October 25 election -- though turnout in the West African nation was a relatively low 50.1 percent.

The president, who has led Côte d'Ivoire since a disputed election in 2010, vowed to "loyally defend the constitution" at his inauguration.

Leaders from 11 African countries attended the ceremony, as well as former leaders such as Niger's Mahamadou Issoufou.

Opposition excluded

Ouattara's two main opponents, Laurent Gbagbo and Tidjane Thiam, were excluded from the ballot -- Gbagbo due to a criminal conviction and Thiam over nationality issues.

Neither politician attended the ceremony.

Ouattara won 89.7% of the vote, Electoral Commission head Ibrahime Kuibiert Coulibaly said.

Jean-Louis Billon, a former commerce minister from one of Côte d'Ivoire's richest families, came in a distant second with 3% of the vote.

Simone Gbagbo, Côte d'Ivoire's former first lady and the ex-wife of former President Laurent Gbagbo, came in third with 2.4%, under the provisional results.

Former colonial ruler France, which maintains good relations with Côte d'Ivoire, was represented by National Assembly Speaker Yael Braun-Pivet.

The United States sent Jacob Helberg, Under Secretary of State for Economic Affairs, who was due to meet with Ouattara in the afternoon.