U.S. Secretary of State John Kerry and Afghanistan President Hamid Karzaiextended talks on Saturday as part of a last-ditch effort to negotiate a security pact that would determine, among other things, how many U.S. troops stay after 2014.
"There are still issues we are finalizing, therefore there is a need for a third round of talks this evening," the president's spokesman, Aimal Faizi, told reporters.
Talks had hit a wall over two sticking points that the United States hopes will be ironed out by the end of the month, a deadline previously set for signing the deal.
Furthermore, four people were killed when suspected Taliban members targeted a police station in eastern Nangarhar province.
A car laden with explosives went off outside the police station, killing two police officer and two civilians, Ahmad Zia Abdulzai spokesperson for Nangarhar province, told the Anadolu Agency.
Eight people were also wounded including five police officers, he said.
Abdulzai blamed the attack on the Taliban but the insurgent group has yet to make comment.