Opposition leader Chakwera has been pronounced the winner with 2.6 million votes, while incumbent president Mutharika has taken 1.75 million and underdog candidate Kuwani over 32,400.
Stampede in primary school wounds 20 other students, officials in the country's western town of Kakemega say.
A Kenyan opposition politician who government authorities deported in contravention of a court order said on Thursday he had been assaulted, drugged and dragged onto a flight to Dubai.
Miguna Miguna is the second person to be arrested in connection with the mock "swearing-in" of opposition leader Raila Odinga.
High Court Judge Chacha Mwita directed the government to restore the transmission of three networks, which the government shut down after they broadcast images of the opposition leader's mock inauguration.
The three channels were switched off on Tuesday after they transmitted live coverage of a ceremony to "swear in" opposition leader Raila Odinga into office.
Government outlaws the opposition's National Resistance Movement, with Interior Minister Fred Matiangi declaring it an organised criminal group.
Opposition leader Raila Odinga said last month he would be inaugurated by a people's assembly on December 12. Under Kenyan law, treason is punishable by death.
President Uhuru Kenyatta's inauguration went ahead on Tuesday. But shortly after the ceremony, opposition leader Raila Odinga also vowed to claim the position on December 12.
Kenya's Supreme Court dismisses two petitions to overturn the country's October 26 presidential election rerun and approves President Uhuru Kenyatta's win for a second term.
Witness says two people shot dead as Kenyan police tried to disperse opposition supporters marching for opposition leader Raila Odinga.
Kenya’s main opposition leader Raila Odinga rejects the latest presidential election, which saw President Uhuru Kenyatta winning with 98 percent of the vote.
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