A deal to form a united government in Afghanistan is "an Afghan solution to an Afghan problem", U.S. Secretary of State John Kerry said, according to BBC News.

Presidential rivals Ashraf Ghani and Abdullah Abdullah have been feuding over the result of the June elections.

"We will form a government of national unity... What unites us is far greater than what divided us during the campaign," Ghani said on Friday, Aug 8.

Kerry held talks earlier with both men in Kabul.

It is not yet clear what the government structure will be under the power-sharing deal.

The presidential rivals agreed to a vote audit during Kerry's last visit and both contenders said they would abide by the result.

All 8 mln ballots are being reviewed in an attempt to resolve the dispute over the result of the June 14 second round.

Preliminary results announced by Afghan election officials gave Ghani 56.44% of the votes, with Abdullah gaining 43.45%. But they accuse each other of electoral fraud.

Kerry met President Hamid Karzai and then Abdullah, a former foreign minister, and Ghani, who used to be finance minister.

Abdullah called the agreement "another step forward in the interests of strengthening national unity in the country, strengthening rule of law in the country and bringing hope to the people for the future of Afghanistan."