A volcanic explosion caused by hot magma streaming into snow on Mount Etna injured 10 people on Thursday.
Etna burst into life again two-and-a-half weeks after its first eruption in over a year.
Morelle said that a volcanologist at the scene told her it was the most unsafe incident he had experienced in his 30-year-career.
The BBC's science correspondent Rebecca Morelle and her team were among those forced to flee, with camerawoman Rachel Price recording incredible footage of the massive cloud of ash bursting from the earth.
Mount Etna is the largest active volcano in Europe and has one of the world's longest records for continuous eruption.
The volcano started erupting yesterday, but experts said the level of eruptions had decreased today.
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It is not known what the BBC crew were doing at the volcano.
"Explosions like this have killed", she said.
"Running down a mountain pelted by rocks, dodging burning boulders and boiling steam - not an experience I ever ever want to repeat", she tweeted.
At least 8 people were injured on Thursday when an explosion occurred as lava continued to spew from Sicily's Mount Etna.
Authorities said the four of those hurt had to be hospitalized, mostly for head injuries, but all were expected to recover.
Officials at Sicily's Catania airport announced they would reduce arrivals by half to five flights an hour, due to ash clouds. The volcano previously had an active eruption rate of 1.7 years until 2001, when activity became more frequent.
"Just confirmed - everyone taken off the mountain okay - rescue team and guides here were brilliant".