On Friday morning, in anticipation of the official results being announced, Odinga's supporters staged protest marches in some areas, including burning tires in some of Nairobi's largest slums.
With more than 98% of polling stations reporting, Odinga trailed incumbent President Uhuru Kenyatta in a 54%-45% split Thursday.
Over 400 global election observers - including officials from the United States and the European Union - were deployed across the country to monitor voting, the tallying process and part of the post-election period.
The electoral commission admitted that hackers had tried to access its database, but said they did not succeed. Global elections monitors say they have seen no clear evidence to support such charges.
"This is a fraud of monumental gravity".
Kenyans waited anxiously on Friday for the results of a heated presidential election earlier in the week that has brought the country to a near standstill.
He said the opposition's own informal vote tally gave him 8.1 million votes compared with 7.2 million for Kenyatta. Kenya dropped six places in Transparency International's Corruption Perceptions Index past year, putting it among 30 countries seen as the world's most corrupt. A few miles from Kibera, there are Land Rover dealerships and new glass high rise towers, but the slum remains crime-ridden and poor, much of it without plumbing or electricity. "I don't control the people but I have asked them to remain calm", he told journalists. He doesn't say what measures, if any, the opposition might take. He witnessed demonstrators chanting "No Raila, no peace", - the rallying cry for Odinga supporters during the 2007 violence - and throwing rocks at police, .More news: Iran bans two players after facing Israeli side
"The IEBC should be given an opportunity to complete its tallying", said Heather Nauert, U.S. State Department's spokesperson in a statement issued on Thursday night. "People want to see justice".
"If they can open those servers, and we all look at it, we are prepared to accept the results of what is contained in those servers", James Orengo, chief election agent for the NASA opposition coalition, told reporters.
He said the electoral commission is verifying electronic online reporting with the physical ballot forms from polling stations.
"As for now, I can not say whether the election has been hacked".
"Going to court, for us, is not an alternative".
We sampled reactions from various people concerning the ongoing situation in Kenya.
"We raised some very serious concerns, they have not responded to them. At the end of the day we shall do an audit and those questions will be answered", he said.More news: Pep Guardiola - Manchester City squad won't need big changes in future
The election commission has disputed opposition allegations of vote-rigging.
"People are not happy", said opposition supporter Oyoo Ogango, 30, who is unemployed with three children.
"Kenyans are good people".
"There has always been only one way to run these elections: in line with the Kenyan Constitution and through the institutions mandated by that Constitution", they said. To avoid a run-off, a candidate must win an absolute majority of the popular vote and at least a quarter of ballots cast in more than half the nation's 47 counties.
Provisional results released shortly after the polls on Tuesday suggested Kenyatta, in power since 2013, was the victor by a substantial margin.
There have already been sporadic clashes between police and protesters in parts of Nairobi, the capital, and opposition strongholds in western Kenya.
Preliminary tallies showed Kenyatta heading for a resounding victory, but Odinga has alleged that the electoral commission's computer systems were hacked, the count is fraudulent and that he won. The Luo are one of the major ethnic groups in Kenya, but a Luo has never been president of Kenya, and many members of the tribe attribute their socioeconomic troubles to their group's political exclusion. Other ethnic groups were also drawn into the violence. He also lost the 2013 vote to Kenyatta and took allegations of vote-tampering to the Supreme Court, which rejected his case.More news: Second Man Charged in Clinton Police Shooting
"And should there be a need to challenge any of the proceedings or outcomes, petitions through the courts are the avenue to take".
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