NATO members have failed to agree on any offer to send more troops to Afghanistan following talks in Belgium.
A NATO spokesperson said it could be weeks before reinforcements are committed. It is thought it could take until a meeting of NATO defence ministers on 28 September to finalise offers.
Today's meeting was held following pressure from military commanders in Afghanistan who say another 2,500 are needed to help in the fight against the Taliban.
NATO Supreme Commander, James Jones, acknowledged last week that the alliance had underestimated the strength of Taliban resistance and called for added troops, helicopters and transport aircraft.
The south of the country has seen the worst violence since US-led forces toppled the Taliban five years ago.
Since taking control of operations in southern Afghanistan on 31 July, NATO-led forces have been confronted by a resurgent Taliban.
More than 90 foreign troops have been killed in the region this year, and the casualties in the south have raised questions over NATO's ability to successfully complete its mission.
Eight die in western Afghan clashes
At least eight people have been killed and 11 wounded in clashes between suspected Taliban militants and police forces in western Afghanistan.
Four Afghan police officers and four militants died when a police convoy was attacked in the remote Farah province.
Separately, two rockets struck the eastern city of Jalalabad hours before Afghan President Hamid Karzai and Pakistan Prime Minister Shaukat Aziz arrived to open a new road between the city and the Pakistan border.
One rocket hit the outskirts of an airport compound and the other hit a civilian home but no casualties were reported.
In Kandahar, a suicide bomber was killed and a civilian suffered minor injuries in an apparently premature blast at a mosque in the southern city.
The mosque was empty at the time of the blast and collapsed following the explosion.
Kandahar, at the centre of the Taliban-led insurgency, has seen most of the nearly 40 suicide blasts in Afghanistan this year.
More than 100 people, almost all of them civilians, have died in the attacks.
