Afghan President Hamid Karzai has suspended talks on a security pact with the United States, stating Washington is sending mixed messages  on peace talks with the Taliban, Reuters reported.
"In a special meeting chaired by President Hamid Karzai, the president has decided to suspend talks about a security pact with the U.S. because of their inconsistent statements and actions in regard to the peace process," said Aimal Faizi, presidential spokesperson  and director of communications for Afghanistan.
Negotiations on the Bilateral Security Agreement  started earlier this year and, if completed, may define future realtions between the U.S. military and Afghanistan.
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On Wednesday, the Taliban claimed responsibility for the killings of four U.S. forces in an overnight attack on Bagram Air Base in Afghanistan, just hours after Washington said  its officials would meet the insurgents for talks.
“Last night two big rockets were launched at Bagram (air base) which hit the target. Four soldiers are dead and six others are wounded. The rockets caused a major fire,” Taliban spokesman Zabihullah Mujahid told the AFP. 
According to the Huffington Post, insurgents attacked the base with some kind of indirect fire, leaving open the possibility it was hit by rockets or mortar rounds.