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In other slum and poor areas around the capital, as well as the western city of Kisumu, gunshots rang out and protesters lit fires in the street.
The fury from Odinga's supporters came in stark contrast to the cheers from Kenyatta's camp in his strongholds, with vuvuzelas and cries of joy in the streets.
The country has largely been peaceful since Tuesday's election.
A spokesman called the vote a 'charade' and said going to court to challenge it is not an option.
The police denied him access to a lawyer, but released him without charge after four hours.
’s committee session is symptomatic of risks and challenges they have faced under President Uhuru Kenyatta, who took office in April 2013, and is seeking reelection in general elections scheduled for August 8, 2017.
Two people were killed in Nairobi as they took advantage of the protests to steal, Nairobi police chief Japheth Koome said, with one being shot in the head.
Kenyan police opened fire on people protesting election results earlier in another opposition stronghold - South Mugirango constituency - killing one person.
The country has been concerned about the kind of post-election violence that rocked Kenya a decade ago and left more than 1,000 dead.
Gunshots have been reported in the Nairobi slum of Kibera and in the southwestern city of Kisumu. Kisumu resident Lucas Odhiambo said: 'There are gunshots all over; we don't know how it will end but we are praying for peace.'There was peace but people started blowing vuvuzelas as soon as the results were announced and police moved in.'Kenya's president is asking the country to 'shun violence' as unrest erupts in some opposition areas after the country's election commission announced he had won a second term. Supporters of opposition candidate Raila Odinga have rejected the results but said challenging them in court is not an option.
Odinga made a legal challenge after losing to Kenyatta in 2013, alleging vote-tampering, but was unsuccessful.
The Kenyan commission said Mr Kenyatta won Tuesday's election with 54 per cent of the vote and called the poll 'credible, fair and peaceful'.
Mr Kenyatta called for peace and unity after the announcement and said: 'There is no need for violence.'Hundreds of police in anti-riot gear lined the streets of the capital, Nairobi, amid fears of further protests by supporters of opposition candidate Raila Odinga who claims the vote was rigged.
Police have reportedly used teargas on protesters in the Kisumu and Nairobi slums.