A volcano in the Russian Far East peninsula erupted several days ago, prompting experts to raise the hazard level caused by the possible massive eruption.

The volcano Kizimen, located in the Kamchatka Peninsula, has spewed ashes as high as 10 km into sky and the western slope of the mountain has been covered with ashes due to high winds.

The snow on the slope was thawing quickly, pushing river water level up by 60 cm.

Specialists don't rule out the possibility of a massive eruption of Kizimen, which has remained dormant for 80 years.

A helicopter would soon be sent to the site to check whether the eruption was still going on.

The nearest human settlement is about 110 km away from the volcano.

The Kamchatka Peninsula has a high density of volcanoes, flanked by large volcanic belts containing about 160 volcanoes, with 29 of them still active.