Tanzania 's actions during the 1994 Rwandan genocide have been alleged to have violated the non-refoulement principle . During the height of the crisis , when the refugee flows rose to the level of a " mass exodus , " the Tanzanian government closed its borders to a group of more than 50,000 Rwandan refugees fleeing genocidal violence . In 1996 , before Rwanda had reached an appropriate level of stability , around 500,000 refugees were returned to Rwanda from Zaire
Rwandan genocide
Rwandan genocide
Non-refoulement