In other battlefield developments, anti-Taliban forces said they were poised to take the enclave of Kunduz in the north.
With battlefield advances outpacing political plans, world leaders sought a solution for a country racked by war since 1979.
The UN Security Council on Wednesday unanimously endorsed an Afghan political plan envisaging a two-year interim government bringing all ethnic groups under one umbrella with a multinational security force to protect them.
Spokesmen for the Northern Alliance said it had no desire to cling to power but that it would run Kabul until a broad-based post-Taliban government was formed.
Alliance factions have already split Kabul along ethnic lines -- a sign it could be reverting to the divisions that sparked civil war when the groups took over from the Soviet-installed government in 1992.
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