LONDON, United Kingdom -- 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.



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



The fire happened Feb. 15 in southwest London.

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