According to Agence France Presse, a New Zealand Civil Aviation Authority document said the pilot, who has not been named, had voluntarily submitted a fatigue report, blaming the incident on having a bad night's sleep in London the night before.

BBC: Air New Zealand pilot 'fell asleep' during flight

Investigators found the charred helicopter wreckage Sunday morning and discovered that Oviedo, his bodyguard and the chopper's pilot had perished, Paraguay's civil aviation authority said.

CNN: STORY HIGHLIGHTS

It also prompted accusations that authorities have let safety standards decline amid the political turmoil and infighting, although civil aviation officials said the balloon had been inspected recently and that the pilot may have been to blame, jumping out rather than stopping the fire.

NPR: Fiery Balloon Accident Kills 19 Tourists In Egypt

The head of the Civil Aviation Administration, Mohammed Sherif, told The Associated Press at the scene of the crash that the pilot had just renewed his license in January.

NPR: Fiery Balloon Accident Kills 19 Tourists In Egypt