"They knew they were going to steal an election. They knew the people would be unhappy. Therefore all the instruments of violence were put in place," Mr Orengo said.
The Kenya National Commission on Human Rights meanwhile said 24 people had been shot dead by police during protests.
Mr Matiang'i said most areas were calm but there had been some violence which he blamed on criminals.
Kenyan media reactsRamogi FM radio, which broadcasts in the Luo language of defeated candidate Raila Odinga, played gospel music - a break from the usual Saturday discussion programmes.
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