Chief Justice David Maraga said a majority decision by the panel of six judges, with two dissenting, found that President Uhuru Kenyatta "was not validly elected", rendering the result "invalid, null and void". The country's electoral commission had already declared incumbent President Uhuru Kenyatta the victor of last month's election, with 54.3 percent of the vote in a contest were almost 80 percent of Kenya's 19 million registered voters were said to have cast ballots.
Odinga has claimed that hackers last month used the identity of a murdered Kenyan election official, who had been in charge of the electronic voting system, to gain entry to the election commission's database in order to manipulate voting results.
Other elections in Africa have been annulled or cancelled but this appears to be the first time on the continent that an opposition court challenge against a presidential poll result has been successful.
This is the fourth time 72-year-old Odinga has lost an election, often citing irregularities.
"The nullification will lead to high turn out during the repeat election".
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NASA leaders Raila Odinga, Kalonzo Musyoka, and Musalia Mudavadi have lunch at Pronto Hotel in Nairobi on Tuesday, August 29. Six Supreme Court judges backed the ruling. Odinga said he would challenge the results in the Supreme Court.
Lawyers for Kenyan President Uhuru Kenyatta are calling the Supreme Court's nullification of last month's election a "very political decision" but they say they will live with the consequences.
In a statement, Justus Nyang'aya, country director for Amnesty International Kenya, said the decision "demonstrates the independence of Kenya's judiciary and sets an example for the rest of the world".
Opposition members danced in the streets, marveling at the setback for Kenyatta, the son of the country's first president, in the long rivalry between Kenya's leading political families. Kenyatta won, receiving about 1 million more votes than his opponent.
The court has not yet published its full written ruling explaining why the election was invalid but has 60 days to do so.
They say that if it will be hard to choose and collect viable replacements for these heads to conduct these new elections, they suggested the United Nations conducting these new elections.
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As news of the court's decision spread, cheers and celebrations could be heard on the streets in parts of the capital, Nairobi.
Kerry previously said he was confident in the integrity of the election.
"It is important to respect the rule of law. we are ready to go back again to the people with the same agenda", he said as he appealed for calm.
Kenya's $2 billion sovereign bond maturing in 2024 fell 1.33 cents, according to Tradeweb data, its lowest since mid-August.
Kenya's electoral commission has said there was a hacking attempt but it failed.
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