Thousands of Rwandan refugees, fleeing violence in Burundi, have begun a two-day trek toward Tanzania in what aid officials said Thursday could become a repeat of last year's huge migrations.
An estimated 20,000 Rwandan Hutus were on the road between the north-central Burundi town of Ngozi and the central town of Muyinga, said Paul Stromberg of the U.N. High Commissioner for Refugees in Bujumbura.
The refugees were responding to an armed attack on Majuri, one of seven refugee camps in northern Burundi, and violence in Bujumbura, Burundi's capital.
More than 1 million Rwandans fled civil war and genocide in that country last year. About 200,000 went to Burundi. Extremist Hutu militias associated with Rwanda's former Hutu-led government were blamed for most of the killings of as many as 500,000 people. The majority of the victims were Tutsis.