Despite back-to-back meetings yesterday with rivals Abdullah Abdullah and Ashraf Ghani and other officials that stretched deep into the night, US officials said an accord was not yet on the table.
The deadlock over last month's run-off vote to succeed outgoing President Hamid Karzai has plunged Afghanistan into crisis and dented US hopes of a smooth transfer of power as Washington seeks to withdraw all its troops by late 2016.
On a day of intense diplomacy today, Kerry met Abdullah for about an hour and 20 minutes before holding talks with Ghani and meeting Karzai.
While Ghani's campaign has embraced the UN plan, Abdullah's team remains sceptical, arguing the proposal to review some 44 per cent of all votes cast fails to address all their concerns.
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Yesterday Kerry stressed that results released on Monday showing Ghani in the lead with some 56 percent of the vote were only "preliminary".
"They are neither authoritative nor final, and no one should be stating a victory at this point in time," Kerry said.
Abdullah, who has already lost one presidential bid in controversial circumstances, has declared himself the true winner, saying massive fraud robbed him of victory in the June 14 run-off vote.
US officials told reporters that "many ideas were under consideration" but that the initial talks had been "constructive" and "substantive".
Kerry was focusing on two tracks, a senior US administration official said.
"One is cleaning up the tally, so to speak, to the extent possible so that the process is more credible. But two, creating a dialogue where the Afghans can have the conversation" on a path forward, the official said.