[3] A 2006 French inquiry with the International Criminal Tribunal for Rwanda accused Nyamwasa, Kagame and four other officials of organizing the shooting down the plane of then Rwandan president Juvénal Habyarimana.
Historian Gérard Prunier states that he and others may have been envious of the foreign aide money being siphoned off by Kagame and friends around this time.
[2][6] When he returned to Rwanda to bury his mother, he was summoned by military officials who are alleged to demand "he write Kagame an apology for a list of perceived infractions.
[1] In South Africa, Nyamwasa partnered with former RPF official Gerald Gahima and Theogene Rudasingwa to create the opposition Rwanda National Congress.
[2] The Rwandan government later stated that he may have been working with Colonel Patrick Karegeya, another former intelligence head who was living in exile in South Africa.
[2] The day after Karageya's assassination, President Kagame told a rally “Whoever betrays the country will pay the price, I assure you...Whoever it is, it is a matter of time.”[7] In June 2010, Brigadier General Jean Bosco Kazura, head of the Rwandese Association Football Federation, traveled to South Africa to see the World Cup and allegedly contacted Nyamwasa.
[13][14] Nyamwasa is accused by Rwandan authorities of involvement in acts of terrorism, including three grenade attacks in Kigali on 19 February 2010,[9] but was not arrested in South Africa due to a lack of evidence and extradition treaties between the two countries.
In 2011, the Military High Court in Kigali condemned him and other RNC founders for terrorist acts, threat to state security and public order.