One protester was killed in the port city of Kisumu, according to Human Rights Watch, while another two were reported dead in the Mathare shantytown by a local NGO, Efe news reported.
Local media reported that a fourth person was killed in the town of Siaya.
As the protests continued, police in Kisumu cut access to the city centre and security forces in Nairobi's Kibera suburb used teargas against demonstrators and journalists.
On Friday, Kenyatta was declared the winner of Tuesday's election by the Independent Electoral and Boundaries Commission (IEBC), winning his second term with 54.3 per cent of the vote. His rival Raila Odinga got 44.7 per cent votes.
The announcement of the final tally was delayed by seven hours and took place without representatives of the National Super Alliance (NASA) opposition coalition being present.
They boycotted the presentation after signalling that they would not accept the results. The opposition called the election process a "charade".
The NASA had claimed that the IEBC's electronic vote counting system had been hacked and given Kenyatta a 700,000-point advantage.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.
This website uses cookies.