The Lake Geneva region is fighting a growing number of violent home robberies of its wealthiest residents, which threaten the area’s reputation as a haven for the ultra-rich and have inflamed suspicions across the border with France.

Swiss authorities are turning to video footage, number-plate recognition and tougher border policing as they try to crack down on the “homejackings”, which have shocked the normally peaceful area.

The attacks typically involve intruders breaking into occupied homes and threatening residents — sometimes at gunpoint — before escaping with watches, jewellery and other valuables across the border to France.

Private bankers, commodities traders and other wealthy executives are among those who have been targeted, fuelling concern in a region that is home to some of the world’s biggest banks and trading houses. Companies including Pictet and Trafigura have raised concerns about the attacks with authorities, according to people familiar with the discussions.

The extreme violence of the attacks has prompted some politicians to call for targeted checks at the French border, and prompted many wealthy communities to hire private security.

“This trend has recently become much more organised, targeted and common,” said Florence Bettschart-Narbel, a member of the legislature in the Canton of Vaud, on the north side of Lake Geneva. “We are concerned about the impact on Switzerland’s attractiveness to foreigners and companies.”

Among the most prominent victims is Alain Prost, the four-time Formula 1 world champion, whose home near Nyon, on the west side of Lake Geneva, was raided in May.

During the raid, one family member suffered a minor head injury while another was forced to open a safe containing valuables, according to authorities.

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