A police officer is among four people who were injured in anti-election protests in Huruma and Mathare on Thursday.
One voter was hacked several times and seriously wounded, while the others suffocated as police fired teargas at residential houses.
The officer was injured on the head while clearing barricades placed on the road by protesters.
He was treated at a mission hospital in Eastleigh and discharged.
Mathare AP commander Kiprono Langat said the sergeant was hit with a stone by a person in a storey building, prompting other officers to fire teargas at the property.
"We are telling them to stop it because they will prompt police to fire teargas at the houses, which will prompt the police to fire teargas to their residential houses," he said.
In the morning, protesters blocked voters from accessing two polling stations in Mathare before police intervened and dispersed them.
Residents said most of those protesting were known criminals who were creating commotion to loot.
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"I am a NASA supporter and I know the people who organise and lead NASA protests here and I can't see any. These are criminals causing lawlessness to loot during the chaos," said Musyoki Muli, a resident.
Lucy Njoki, a trader, lost property worth more than Sh200,000 in the chaos as criminals looted her gas cylinders after a supplier delivered filled up containers.
"The supplier offloaded filled containers in the morning before I went to vote and told me he will collect the empty containers in the afternoon. I left some on the display and others in the store as the government had assured us of safety," she said.
"I came back after voting and remained in the house and two hours later this [looting] happened," she added.
Njoki said looters were moving in groups of twenty and they broke into the store taking everything with them.
"They destroyed two of my rental stalls. I am left with nothing," she said.
Voting in most polling centres was below 10 per cent.
In Kamukuji constituency, there was low voter turnout but the process was peaceful.
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