KABUL — Using bulldozers, pick axes and shovels, rescue teams intensified their search today for remaining survivors hit by avalanches on a key mountain pass in Afghanistan as the discovery of one body raised the death toll to 167.

Some 3,000 people have already been rescued from the snowbound, 12,000-foot-high Salang Pass, which is the major route through the Hindu Kush mountains that connects the capital to the north.

Defense Ministry official Ahmad Zia Aftali said the corpse of a woman whose son was rescued a day earlier was found under the snow in the morning on the pass. Aftali said the Afghan side plans to ask the international coalition for additional equipment to aid in the search. He said they did not expect to find anyone still alive.

Hundreds of soldiers and police plowed through huge snowdrifts to clear the 2 miles of road that had been blocked off when a series of avalanches Monday sent tons of snow and ice crashing down onto hundreds of vehicles along a treacherous stretch of highway.