The Turkish leader reiterated that the perpetrators of the killing were among 18 Saudi high-ranking officials who were specifically sent to Istanbul before Khashoggi's visit to the consulate.
A study on global trends in media published by the UNESCO in 2017 highlights that impunity for crimes against journalists remains the norm, and trends in kidnappings, disappearances and torture have shown substantial increases since 2012.
The German leader emphasized that the evolving explanations given to date by Riyadh for the journalist's death were insufficient.
The business summit is being hosted by Saudi Arabia's Public Investment Fund, which has invested in some Silicon Valley tech firms such as Uber and other startups.
Khashoggi's disappearance has drawn international condemnation and sparked warnings from US President Donald Trump on Saturday of "severe punishment" if the Saudis were found to be behind his death.
