Militants attacked with grenades and automatic weapons.
Attack occurred at busy market in an eastern province.
Ashraf Ghani has called for an "extensive audit" of votes cast in Afghanistan's disputed presidential election.
Abdullah Abdullah has claimed victory despite results giving a lead to his rival, Ashraf Ghani.
After a relatively stable first election round, the presidential run-off has been marred by fraud claims.
Candidate Abdullah Abdullah said ballot boxes had been stuffed to the benefit of his rival Ashraf Ghani.
About 170 militants have been killed in Pakistan's northwest.
Taliban releases footage of Bowe Bergdahl's handover to U.S. forces.
Government argues transfer of men from a Guantanamo Bay jail to Qatar violated international law.
Bomber drove into minibus carrying three construction engineers.
