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Relief officials said some 270,000 people had fled into Rwanda, another highland nation which also has a mixed population of Tutsis and Hutus, since the coup.
Local residents have sought to help the refugees as best they can, while awaiting refugee officials from the United Nations and international aid bodies to take them in hand.
The U.N. Security Council in a statement on Monday condemned the coup, in which several of Ndadaye's aides were also said by surviving cabinet ministers to have been killed, and called for an immediate return to constitutional rule.
"The Security Council demands that the perpetrators of the military coup cease all acts of violence, reveal the whereabouts and fate of government officials ... and put an immediate end to their illegal act with a view to the immediate reinstitution of democracy and constitutional rule in Burundi," the statement said.
The statement also paid tribute to Ndadaye, saying he and his government made a "supreme sacrifice for democracy."
Surviving ministers have holed up in the French embassy in Bujumbura, where they on Monday said they had begun to rally loyal troops and had regained control of unspecified "strategic sites" in the capital.
They refused offers from the coup plotters to let them return to power in exchange for an amnesty for soldiers involved in the putsch.
Phone lines to the Burundi capital were down on Tuesday, operators in Nairobi said, but the Belgian government said it had called on all its 1,500 nationals in Burundi to gather in Bujumbura as a "preventive" measure.
A foreign ministry spokesman in Brussels said the measure was to guarantee access for Belgian nationals to essential supplies, but stressed that there was no plan immediately to evacuate them from Belgium's former colony.
Uganda's President Yoweri Museveni on Tuesday called for military intervention by east and central African countries to resolve the crisis in Burundi.
He told a press conference in Kampala that he planned to consult regional heads of state.
at-bur/nb/dm AFP AFP
