The luminescence over the volcano summit is evidence that glowing lava is flowing in the crater.
The volcano may start blowing out ash any moment now.
The Level of Concern Colour Code has been raised to Yellow, which is a potential danger warning for aircraft. The giant volcano last erupted from September 2009 to December 2010, and it began to again wake up in June this year. Klyuchevskoy volcano is 4,750 metres above sea.
Voice of Russia,TASS