Afghan President Hamid Karzai has suspended talks with the US on a security pact, accusing Washington of providing "inconsistent statements" on peace talks with the Taliban.
"In a special meeting chaired by President Hamid Karzai, the president has decided to suspend talks about a security pact with the US because of their inconsistent statements and actions in regard to the peace process", Karzai's spokesman Aimal Faizi told Reuters.
The US Embassy in Kabul said it was preparing a statement following the announcement.
Afghan President Hamid Karzai has suspended security negotiations with the US over the peace process, his spokesman told Reuters.
The Taliban have claimed responsibility for an attack on the Bagram air base in Afghanistan that killed four US troops.
The attack came hours after the US announced it would open direct talks with the Taliban.
Four US forces have been killed in an attack on the Bagram air base in Afghanistan, a US official told Reuters.
After nearly 12 years, the Taliban and the US are to hold talks on finding a political solution to the end of the war in Afghanistan. The peace talks will include Afghan's President Karzai, and will be the first step on what could be the long journey to peace and stability for the country.
International Editor Bill Neely reports.
The Taliban have opened new offices in Doha ahead of holding historic talks with the US aimed at finding a political solution to end the war in Afghanistan.
In Doha a spokesman said the group opposes the use of Afghan soil to threaten other countries and supports the negotiating process - two demands made by the US and Afghan president before talks can begin.
The Taliban has opened an office in Doha ahead of Afghanistan peace talks with the United States, which will reportedly take place on Thursday.
The United States and Taliban peace talks will take place on Thursday in Doha, a senior US official told Reuters.
US President Barack Obama said an Afghanistan-led peace process is the only way towards peace in the country and added that the Taliban must renounce al-Qaeda.
Obama also commended Afghanistan's President Hamid Karzai for the "courageous step" and said the process would not be easy or quick.