This is the dramatic moment hikers who were admiring majestic mountain peaks fled in terror as an avalanche came hurtling towards them.The visitors had pulled over in their cars to see the spectacular Nyenchen Tanglha range, known as the Swiss Alps of China near Nyingchi, in Tibet on May 8.But within seconds a huge avalanche started to thunder down the mountains engulfing the lower slopes.As the spectators screamed and ran, snow from the avalanche began to cascade down on them as they tried desperately to outrun it.Local media reported that despite its size the avalanche did not cause fatalities or injuries.An avalanche is a mass of snow, ice, and rock that slides down a mountainside. Avalanches can be caused by a number of factors, including: