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.
Official peace talks on Afghanistan between the United States and the Taliban were delayed today, amid a row about an office.
American negotiators will sit down with black turbaned men from the Taliban, at least one of whom speaks impeccable English.
Afghan president Hamid Karzai says his government will not take part in any peace talks involving the Taliban - at least for now.