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HOH XIL, Qinghai, Sept. 24 -- Rescuers have reached seven rangers trapped by a sudden blizzard since Saturday in the Hoh Xil National Nature Reserve on the Qinghai-Tibet Plateau.

The reserve's administrative bureau said on Wednesday that the two teams met in the remote mountain on Tuesday, and are on their way back.

On Saturday, the rangers used satellite phone to ask for help after their two vehicles were out of fuel and they could only hold out for three days with the remaining food.

The bureau sent a group of eight wardens in three vehicles for the rescue. However, by Tuesday morning, the rescue vehicles were mired in snow-swamped ground.

Dubbed "No man's land", the 45,000-square km Hoh Xil reserve steeples more than 5,000 meters above sea level.

Established in 1998, the Hoh Xil National Nature Reserve has helped rehabilitate the population of endangered Tibetan antelopes, thanks to rangers' work to combat poaching.

The number of Tibetan antelopes in or near the reserve has increased to 35,000 from about 20,000 in 1998.

Buqung, head of the administrative bureau, said the bureau has more than 20 rangers. A mountain patrol in the reserve usually last for a week, during which rangers cover 2,000 km long distance.

"The global warming has taken its toll in the reserve, resulting in rising lake water and melting frozen soil, which has made driving more and more difficult," he said.