Aid workers in Afghanistan say at least three people have died of suffocation inside the Salang Tunnel north of Kabul. The tunnel is blocked by snow from Wednesday's avalanche.
Witnesses say dozens of people trapped inside the three-kilometer long tunnel have been rescued by local villagers.
Afghan authorities say a 20-vehicle convoy is buried in the avalanche and many other cars and trucks are also trapped. They say all traffic along the country's main north-south highway have stopped near the site of the avalanche, some 100-kilometers north of Kabul.
Rescue efforts were hampered by heavy snow, high winds and sub-freezing temperatures in the region, which is some four-thousand meters above sea level in the Hindu Kush mountains.
The interim Afghan administration has asked the British-led peacekeeping force and U-N relief officials for help in rescue operations.
The Soviet-Built Salang Tunnel was reopened last month, after being blown up in 1996 amid heavy fighting between Afghanistan's former Taleban regime and the opposition Northern Alliance.