Police in the western Kenyan city of Kisumu have fired live rounds to disperse stone-throwing supporters of opposition leader Raila Odinga, who claims this week's elections are rigged, a Reuters witness says.
Separately, a Odinga supporter protesting in the Nairobi slum of Mathare was shot dead by police, witnesses told a Reuters reporter who viewed the body.
Earlier on Wednesday as votes were counted President Uhuru Kenyatta had a commanding lead but Odinga said hackers broke into election commission computer systems overnight, leading to massive fraud.
The election commission said on Wednesday the voting process was free and fair and it was investigating whether its computer system was hacked.
Odinga's comments raised concerns of unrest over the results in Kenya, East Africa's leading economy and a regional hub. More than 1000 people died after the 2007 election.
Speaking at a news conference, Odinga urged his supporters to remain calm, but added: "I don't control the people".
His deputy Kalonzo Musyoka also called for calm but said the opposition might call for unspecified "action" at a later date.
On Wednesday afternoon, the election commission website put Kenyatta in front.
He had 55.1 per cent of votes counted to 44 per cent for Odinga - a margin of nearly 1.4 million ballots with more than 80 per cent of polling stations reported.
Odinga published on Twitter his own party's assessment of the count saying he had 8.1 million votes against 7.2 million for Kenyatta.
Local election observers say their parallel vote tally is far from complete so they are unable to support or knock down Odinga's claims. The EU observer mission declined to comment.
Kenyatta, a 55-year-old businessman seeking a second five-year term, had held such a lead since the start of counting after Tuesday's peaceful vote, the culmination of a hard-fought contest between the heads of Kenya's two political dynasties.
Odinga, 72, a former political prisoner and self-described leftist, rejected the results as "fictitious" and "fake".
