On Thursday, a BBC crew and several tourists were on Mount Etna - an active volcano in Sicily - when an explosion pelted them with boiling rocks and steam.
Etna has been experiencing an ongoing eruption, according to Italian news agency RAI, which reported that of 10 people injured in the blast, six were hospitalized, though none with life-threatening injuries.
"Many injured - some head injuries, burns, cuts and bruises", she wrote. "Volcanologist said most unsafe incident experience in his 30 year career", read another tweet from Morelle.
The lava had mixed with some snow, causing a small explosion and then a larger one.
A new lava flow started from the south-eastern crater on Wednesday and was advancing with a temperature above 1000 degrees Celsius in an area covered by snow.
"Explosions like this have killed", she added.
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The Catania operation center of Italy's volcanology institute confirmed Thursday that members of a team taking measurements on the active volcano had been injured, but had no details on the numbers involved or the seriousness of the injuries. She said the experience was extremely scary.
Etna alpine guide Pippo Mazzaglia said he was up the side of the volcano with a group of 20 people when the phreatic explosion occurred.
The red hot lava flowing from Mount Etna can be seen clearly in the image from Sentinel-2A.
Etna is one of two volcanoes in Italy considered "decade volcanoes" because of how frequently they can erupt.
Europe's grandest volcano is attracting visitors with its latest eruption.