Mount Etna erupts catching BBC crew
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Volcano expert explains why Mount Etna blast happened

17 March 2017 Last updated at 09:31 GMT

Mount Etna is one of the world's most active volcanoes.

It's usually thought to be safe to view lava flows close up but explosions like this one are unpredictable.

Here's volcano expert Dougal Jerram to explain what happened.