More than 400 global election monitors - including from the United States and the European Union - deployed across the country to monitor voting, the tallying process and the post-election period.
Rwanda's President Paul Kagame was the first regional leader who congratulated Kenyatta for a successful election and the trust Kenyans have placed in him. It appealed to senior officials to urge police to stop using live ammunition against civilians.
Most of the protesters were supporters of Odinga, who has rejected the results of the presidential election, calling the vote rigged. Another five people were injured by gunfire in Kisumu. He said he was extending a "hand of friendship" to "our older brother", Odinga.
Several people have died since Thursday in densely populated Nairobi slums during violent confrontation between police and opposition supporters dissatisfied with presidential election results.
Police have countered the rioters with tear gas, and also live bullets fired into crowds in some instances.
There were also protests in western Nyanza province.
In Kibera, Nairobi's largest slum, residents said that at least six people were killed late Friday and early Saturday in clashes with police.
"You can only cheat the people for so long،" the opposition leader said.
President Uhuru Kenyatta was declared the victor Friday of Kenya's hard-fought presidential election, but opposition candidate Raila Odinga alleged the voting was rigged.
"I therefore wish to declare Uhuru Kenyatta... as president-elect،" said polls commission chairman Wafula Chebukati on Friday.
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One man, 28-year-old Moses Oduor, was inside his home in the impoverished district of Obunga when police barged in after midnight as part of house-to-house raids, dragging him out of his bedroom and laying into him with clubs.
His opponent Raila Odinga insists the election results have been manipulated, and protests have broken out in poor neighbourhoods in two of the country's major cities.
Kenyans had endured a tense three-day wait while a definitive count was done of the ballots from more than 40,000 polling stations.
This was despite the fact that results streaming onto the IEBC website showed Kenyatta with 8.1 million votes to Odinga's 6.7 million.
Earlier former USA secretary of state John Kerry, leading an observer team from the Carter Center, expressed confidence in the integrity of the electronic system.
Yakub Guliye, Election Commissioner in charge of Information Technology, said the opposition had not made a formal request and it would not act on a verbal request. "The streets do not".
But the opposition criticised foreign observers.
President Farmajo is confident that the re-election of President Kenyatta would foster further cooperation on bilateral and diplomatic relations between Somalia and Kenya.
Matiangi, who was speaking on behalf of the government before national and worldwide media, also warned that "the government will stop at nothing to protect lives and property of Kenyans".