Mount Etna, a stratovolcano located on the east coast of the island of Sicily, has been regularly erupting since as far back as 1500 B.C., making it the longest erupting volcano on Earth.
"Many injured - some head injuries, burns, cuts and bruises", BBC science reporter Rebecca Morelle tweeted.
The group suffered burns, cuts and bruises and six were hospitalised, according to Italian media outlets.
She said the episode was a "reminder of how risky and unpredictable volcanoes can be", describing it as a "very lucky escape" and "extremely scary".
Snow-covered Mount Etna spews lava during an eruption in the early hours of Thursday.
Europe's largest and most active volcano, experienced an increase in volcanic activity just two weeks after its most recent eruption.
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So far it has not disrupted traffic at the nearby Catania airport or created inconvenience for residents in the area.
A BBC journalist and camera crew were caught in the huge explosion on Thursday.
Morelle added that among the injured was a 78-year-old woman who was very close to the source of the explosion, but safely got away.
"Explosions like this have killed", she said.
A tourist stands in front of Mount Etna in Sicily, Italy, Feb. 28, 2017.
It is Europe's most active volcano and one of the most risky in the world.
There were about 35 tourists at the volcano when flowing magma hit snow, causing the explosions, AP said, citing local authorities.