Tsetop, deputy head of the county government in Dingri, where the base is situated, said he is heading the team to clear the snow-blocked road.

The road connecting the base to Dingri county town, at an elevation of 4,300 meters, is about 115 km long.

"We will do our utmost to reach those who are stranded and clear the road as soon as possible," said Tsetop.

He added that about 15 staff members from the police station at the base are helping to cater for the tourists, who might be spending the night in tents. Accommodation conditions around the base are poor, consisting mostly of large tents and low-grade buildings.

The police office established in 2008 is equipped with an oxygen generator and oxygen cylinders, and there are police officers who can communicate in English and Tibetan.

According to Tian, the tourists were trapped because the snowfall was unexpected. Normally, spring and autumn are the best times to visit the base camp.