The US special envoy to Afghanistan has held an “explosive” meeting with Afghan President Hamid Karzai over the country’s election, the BBC has learnt.
Richard Holbrooke raised concerns about ballot-stuffing and fraud, by a number of candidates’ teams, sources say.
The US envoy also said a second-round run-off could make the election process more credible, the sources said.
Concerns have already been raised about Afghanistan’s election, although final results are not due until September.
A number of senior sources have confirmed the details of a meeting between Mr Holbrooke and Mr Karzai held on 21 August, one day after the election.
The meeting was described as “explosive” and “a dramatic bust-up”.
Mr Holbrooke is said to have twice raised the idea of holding a second round run-off because of concerns about the voting process.