The origins of the conflict in the Democratic Republic of the Congo (known as Zaire until 1997) can be traced to the 1994 Rwandan genocide, during which millions of both Tutsi and Hutu Rwandans fled to the eastern Congo as refugees. One estimate by the UN High Commissioner of Human Rights suggests that as many as 7% of the Hutus that fled to the Congo were members of the Democratic Forces for the Liberation of Rwanda (FDLR), the rebel group responsible for the genocide. When the new Tutsi government was established following the genocide, an alliance was formed between Rwandan and Ugandan backed rebel forces to invade the eastern Congo in order to capture the FDLR rebels, starting the First Congo War (1996–97). This led to the collapse of the precarious regime of Mobutu Sese Seko who had been in power since 1965.