The man arrested in France has a motorcycle helmet similar to one in an e-fit issued by police, according to a French broadcaster. BFM claimed the man lived alone in the mountains and was found with arms in his home.
In November, police released an image of a male motorcyclist they wanted to speak to in connection with the killings. at the time the helmet was said to be "very particular" and one of only a few thousand models worldwide.
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Despite the sunshine in short supply in the places the next few days - it stays warm and a little humid and close in places.
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After a mild and quiet night, the best of the sunshine will be across the south east.