Amnesty International has warned police against using excessive force during post-election protests.
Four people died on Wednesday during protests over presidential results in Mathare slum, Nairobi.
Two children suffocated and died in Area 10 as tear gas was fired at protesters. A man was shot dead and another stabbed.
There are reports police are using live bullets to deter protesters in Kisumu.
Muthoni Wanyeki, AI regional director for East Africa, said force should only be used as a last resort.
"Even then, it should only be the bare minimum to prevent loss of life," she said in a statement on Wednesday.
She noted police have a duty to protect residents when demonstrations become violent.
"Any excessive or disproportionate use of force would violate Kenyan and international law."
Wanyeki further told leaders to ask their supporters to refrain from violence.
Protests began shortly after presidential candidate Raila Odinga alleged hackers accessed IEBC's system and manipulated results.
Raila, who is currently trailing President Uhuru Kenyatta by more than a million votes, claimed the late Chris Msando's login details were used to access the system.
"We have caught them. Hackers gained entry into the election database through Msando's account and directly into chairman Wafula Chebukati's account," the NASA presidential candidate told a press conference.
IEBC acting ICT director Msando, who was to test the KIEMS, was tortured and murdered. Opposition leaders blamed Jubilee but police are still investigating.
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