Jenson Button and his wife Jessica may have been gassed with an anaesthetic while they were burgled in France, according to the McLaren Honda driver's spokesman.

The couple were staying with friends in a rented villa in Saint-Tropez over the Formula 1 summer break and it is believed two men stole jewellery, including Jessica's engagement ring, while they were sleeping.

During the robbery it is suspected the former F1 World Champion and his wife were gassed through the air conditioning in the villa before Monday's break-in.

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Button's spokesperson says the couple were unhurt but left shaken by the incident.

"Two men broke into the property whilst they all slept and stole a number of items of jewellery including, most upsettingly, Jessica's engagement ring," Button's spokesperson said. "The police have indicated that this has become a growing problem in the region with perpetrators going so far as to gas their proposed victims through the air conditioning units before breaking in."

It is estimated that valuables costing up to ?300,000 were stolen from the couple who married in December and an investigation is ongoing.