In early June, a fuel tank collapsed at a power plant and 20,000 tonnes of diesel leaked into the ground and into the Ambarnaja River outside the city of Norilsk.  

Now several plants in Arctic Russia are to be inspected, as they also stand on melting permafrost, similar to the collapsed stock that caused the accident.  

- A preliminary investigation has been initiated for negligence, says Federal Police spokesman Svetlana Petrenko, reports Swedish Radio.  

Although the plant was in need of extensive repairs, it was still in use. Three managers at the power plant have been arrested because of this. The mayor of the city of Norisk is also suspected of not doing his job in connection with the accident. 

Melting permafrost 

Russian authorities believe that the fuel leaked because the stock was on melting permafrost.  

 "There will be a careful analysis of the conditions surrounding all similar facilities and buildings," said Russian President Vladimir Putin. 

This can become a huge job. The country has lots of industries and cities built on permafrost. With climate change, there is a risk that plants and even cities can be damaged, or fall.

It is the unusually warm weather for the season that has caused the warming of the permafrost, according to the BBC.   

The World Wildlife Fund (WWF) has called this the second worst environmental disaster in Russia.