Former US President Jimmy Carter has cut short an election observation visit in Guyana due to health reasons.
Carter Centre officials said the 90-year-old is returning to Atlanta in the US. They did not give details, only saying Mr Carter was "not feeling well".
The Guyana observer mission marks the Carter Centre's 100th mission. Staffers will remain in the South American country to observe the vote.
It would have been Mr Carter's 39th trip to personally observe an international election.
Guyana's national elections are being held on Monday more than a year earlier than schedule because President Donald Ramotar had suspended Parliament to avoid a no-confidence vote. The vote pits his People's Progressive Party against an opposition coalition.