An Indian billionaire is under investigation in Italy after his Lamborghini collided with a Ferrari during a supercar tour in Sardinia, leaving two people dead. Vikas Oberoi was driving the car accompanied by his wife, Gayatri Joshi, a model and actor, when the collision occurred on Monday in southern Sardinia, an official from the carabinieri told Agence France-Presse. A video, filmed from a car on the road behind and published by local media, showed the Lamborghini and the Ferrari travelling in convoy with several other supercars. Several of them passed a van in front of them but when the Lamborghini pulled out, it hit the Ferrari coming up behind. The Ferrari crashed and caught fire, killing the Swiss couple inside, both in their 60s, according to media reports. The Indian couple were not seriously hurt. Oberoi was named as a suspect by investigators looking into a potential double road homicide, the carabinieri official said. Oberoi runs Oberoi Realty, known for constructing high-end suburban condominiums in Mumbai. He is worth $3.7bn, according to Forbes’s real-time billionaires list. Joshi is best-known for her sole Bollywood credit for the 2004 film Swades, in which she played the love interest of megastar Shah Rukh Khan. They have been married since 2005 and have two children.