France: Huge explosion at Lyon University campus

A huge explosion has been seen at a university building in Lyon, France.

Footage of the blast shows a fireball erupting into the sky above the building where a smaller fire could already be seen on the roof.

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Local reports say the building on the La Doua campus in Villeurbanne, north of Lyon city center, is a science library.

The area has been evacuated and firefighters are on the scene.

Police said work was being done on the roof and that a gas bottle exploded, starting the blaze.

At least three people have been lightly injured.

The incident comes days after a blast apparently caused by a gas leak hit a Paris bakery, killing four people and injuring several.