By The Associated Press | Posted - Mar. 1, 2015 at 5:15 p.m.

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LONDON (AP) — London's firefighters say sun rays refracted by a Nutella jar likely caused a house fire.

The city's fire brigade says investigators believe the glass jar — which had been emptied of the hazelnut spread — had been placed on a window sill and refracted sunlight, setting blinds alight.

According to a statement posted Tuesday by the brigade, the family was not at home but the blaze killed a dog.

"It sounds far-fetched that a jar containing a few rubber bands caused a severe house fire but that's exactly what happened," fire investigator Charlie Pugsley said.

The fire happened Feb. 15 in southwest London.

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