Former US Secretary of State John Kerry is among the thousands of expected election observers this time around.
Some in the nation of 44 million people have been leaving the capital because of the threat of chaos, while many are simply going home to vote.
Recent elections in the East African high-tech and commercial hub have been hotly contested, and more than 1,000 people were killed in post-election violence in 2007.
Mr Kenyatta prevailed over Mr Odinga in a 2013 vote that was mostly peaceful but tainted by opposition allegations of vote-rigging.
The detentions occurred at around the same time that armed and masked police raided an opposition vote counting centre, intimidating workers and seizing equipment, Orengo said.
He also said two Ghanaians working on the opposition campaign have been deported.
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Just as we did in District Thirteen.” ― Suzanne Collins, “When the Washington Post telephoned me at home on Valentine's Day 1989 to ask my opinion about the Ayatollah Khomeini's fatwah, I felt at once that here was something that completely committed me.A US-based campaign data company has said that its CEO faces deportation from Kenya after working on the opposition’s campaign ahead of a tightly contested presidential election.The detention of the CEO of Aristotle, Inc has raised concerns about the upcoming vote just days after a top Kenyan election official responsible for the electronic voting system was found tortured and killed.The torture and killing in recent days of an election official, Christopher Msando, in charge of the electronic voting system, has some concerned about the possibility of vote tampering. On Saturday, Kenya’s main opposition party said the American and Canadian who were assisting its campaign were taken from their homes on Friday.James Orengo, a senior member of the opposition National Super Alliance, identified the American as Mr Phillips.In the love column: literature, irony, humor, the individual, and the defense of free expression.