The US Department of Defense said late Monday it could not confirm reports of Northern Alliance forces entering Kabul after Taliban troops had fled the Afghan capital.
"We cannot confirm that at the moment," Pentagon spokesman Tim Blair told AFP at about 23:55 p.m. (0455 GMT Tuesday).
He said the situation on the ground in Afghanistan was "very fluid" and no comments would be made until developments on the ground were clarified.
At the same time, the spokesman said the US military and the opposition Northern Alliance in Afghanistan were not as closely coordinated as it might appear.
"We are not tracking them place by place or city by city," Blair said. "We are an adviser but we are not necessarily giving them the goals they have to achieve."
Between 50 or 60 soldiers of the Northern Alliance, with their distinctive pakool caps were seen entering the city from the north in jeeps and four-by-four vehicles.
They were armed with Kalashnikov rifles and rocket-propelled grenade launchers.
No Taliban fighters were sighted in the city except for a group of four apparent prisoners escorted by opposition soldiers.
US President George W. Bush said Saturday, after talks with Pakistani President Pervez Musharraf in New York, that the Northern Alliance should avoid entering Kabul.
Musharraf has been opposed to the Northern Alliance entering the Afghan capital, arguing restraint was needed to avoid atrocities -- AFP