A politician affiliated to the National Super Alliance (NASA) was injured during confrotations between locals and police in Baba Dogo on Sunday.
The legislator was rushed to Nairobi Hospital for treatment.
Tension remained high in a section of Mathare in Nairobi after the death of four people in Riverside area, Ruaraka sparked protests on Sunday morning.
The four, among them a woman are reported to have been killed by unknown assailants.
According to Nairobi Police Commander Japheth Koome, calm was restored and investigations launched.
Addressing a press conference, Mr Koome said that they had intensified police patrols within the area.
He further warned politicians against inciting locals to violence asking them to preach peace or face arrest.
The residents torched three public service vehicles and blocked Outering Road in the early Sunday incident.
Area Member of Parliament Tom Kajwang’ condemned the killings and called on the police to arrest the assailants.
"I want to grieve with our people and also to tell Matiang’i and the police to carefully handle this matter bearing in mind that ICC is watching," Mr Kajwang’ said from Kisumu.
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