According to Italian news agency ANSA, four people including three German tourists were hospitalised, mostly with head injuries - though none of the injuries was listed as grave.
Morelle said all those involved in the eruption were "okay" and had been brought of the mountain safely by an "excellent rescue team".
"Running down a mountain pelted by rocks, dodging burning boulders and boiling steam - not an experience I ever ever want to repeat".
Mount Etna, Europe's most active volcano, is shown here erupting February 28, 2017.
The group suffered burns, cuts and bruises and six were hospitalised, according to Italian media outlets.
Volcanologists later said the eruptive phase was "diminishing", the Mirror of the United Kingdom reported.
The volcano's activity was not expected to prove problematic for nearby residents or those using the nearest airport in the port city of Catania to the southeast, Channel NewsAsia reported.
At least ten people were injured after a sudden explosion on Mount Etna, Italy, on Thursday, March 16.
A BBC crew and tourists were among those caught up in the drama as people were "pelted with boiling rocks and steam".
Red hot lava can be seen flowing from Mount Etna while the surrounding snow had been edited to a blue colour to distinguish from the clouds.