Chad's electoral commission says President Idriss Deby has won a fifth term as president, defeating more than a dozen challengers.

Provisional results announced late Thursday give Deby, in power since 1990, 61.5 percent of the April 10 vote. The results need to be ratified by the Constitutional Council.

The announcement came one day after a visit by Samantha Power, U.S. envoy to the United Nations, and top U.S. military officials that highlighted Chad's key role in the fight against Islamic militants in Africa.

The land-locked, impoverished nation is the base for France's military operations in Africa as well as a regional force intended to wipe out the Nigeria-based group Boko Haram.

The opposition withdrew from the electoral commission this week, citing credibility concerns.