Two Indians - both aged 38 - died and two others sustained critical injuries when their quad bike flipped over multiple times trying to scale a sand dune in Al Badayer area of Al Madam city on Friday. The accident happened at 7.20pm. On being informed, a police patrol and ambulance arrived at the site and rushed them to Al Dhaid Hospital. Two of them were pronounced dead. The deceased suffered severe internal bleeding in the skull. The other two injured - in their 20s - are being treated in the intensive care unit of the hospital. Police have launched an investigation into the incident.