Are Siberia's mysterious craters caused by climate change? Scientists find four new enormous holes in northern Russia

Four new craters have been spotted by scientists in the Yamal peninsula, in Siberia

May be caused by gas from underground and fear craters becoming more common due to rising temperatures

Bright flash of light seen close to one crater which led to theories that buried gas pockets in the soil may be igniting

Another new crater has been found less than six miles from a major gas plant and experts have called for an urgent investigation into the phenomenon 

By WILL STEWART IN MOSCOW

PUBLISHED: 15:30 GMT, 23 February 2015 | UPDATED: 15:57 GMT, 23 February 2015