Chad's president Idriss Deby has died the day after winning an election, the country's military has said.
Mr Deby, 68, was visiting troops battling rebels in the country's north, an army spokesman said on Tuesday.
He came to power in a rebellion in 1990 and was one of Africa's longest ruling leaders.
The cause of death was not yet clear due to the remote location.
His election victory had given him a sixth term in office but the 11 April vote was boycotted by opposition leaders.