US Assistant Secretary of State for African Affairs Jendayi Frazer said in a statement that it was "imperative" for President Mwai Kibaki and opposition leader Raila Odinga to sit together "directly and without preconditions".
"Both should acknowledge serious irregularities in the vote tallying which made it impossible to determine with certainty the final result," she added.
She also called for the restoration of media freedom and freedom of peaceful assembly and said the only way forward was through equitable power-sharing, an end to violence, reconciliation, and agreement on electoral reform.
"In the meantime, the United States cannot conduct business as usual in Kenya," she warned.
Odinga's Orange Democratic Movement (ODM) has called for three days of mass rallies across the country beginning Wednesday -- a move that has raised concerns of fresh clashes.
The planned protests have been banned by Kenyan police, citing fears that they would attract criminal elements.
The ODM countered on Saturday, saying that the real threat came from organised gangs belonging to Kibaki's Kikuyu trice.
The gangs intend to "wreak havoc on ODM supporters as a way to terrify them from participating in rallies," party spokesman Salim Lone told AFP.
Frazer's appeal for dialogue echoed that of UN Secretary general Ban Ki-moon who warned Kibaki and Odinga on Friday that the absence of a negotiated solution would be disastrous.
"The potential for further bloodshed remains high unless the political crisis is quickly resolved," Ban said in a statement.
The full article US pushes Kenya factions to admit vote flaws
We wait and see what happens, and whether the US not conducting business as usual with Kenya will have an impact on the situation.
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