The announcement came as Parliament began proceedings to impeach him, six days after the military seized control in the capital, Harare, and placed the 93-year-old leader under house arrest.
Crowds in the streets of Harare broke out in rapturous celebrations, raising their fists and waving Zimbabweans flags to mark the historic moment.
Mugabe's resignation marks the end of an era in Zimbabwe. He ruled the country with an iron fist for almost four decades and is the only leader the nation has known since it achieved independence from Britain in 1980.
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