South Africa has expelled three Rwandan diplomats it says are linked to an attack at the home of a dissident Rwandan general.

On Monday, a group of armed men broke into the South African home of former Rwandan army chief Faustin Kayumba Nyamwasa, who is an exiled critic of Rwandan President Paul Kagame.

Nii Akuetteh, an independent African politics specialist, tells Al Jazeera that Rwanda's president has a history of forcing his opponents into exile to stop them from challenging the accepted version of events about the 1994 genocide.