The International Criminal Court in The Hague is considering a case against six high-profile Kenyans accused of crimes against humanity.
Three of the six suspects accused of orchestrating deadly post-election violence in Kenya are set to appear before court on Thursday.
Both the prosecution and defence will put forward their evidence ahead of a decision by the pre-trial chamber on whether to dismiss or confirm the cases.
The individuals include William Ruto and Uhuru Kenyatta, two hopefuls in Kenya's next presidential election.
The six are accused of various war crimes, including murder, forced deportations and rape during the 2008 post-election violence in which about 1,300 people were killed.
Al Jazeera's Catherine Soi reports from Nairobi.