Gangs of road pirates pose an increased threat on Swedish highways, Swedish radio news channel SR reported. The highway robbers strike at night, attacking travelers who have parked their mobile homes by the road to sleep. Swedish police said 30 robberies had already been reported this summer, most of them in the southern and western parts of the country. In seven robberies, the pirates sprayed anesthetic gas into the mobile homes to ensure that its residents remained asleep while they stripped the cabin of valuables. Tourists are warned about the robbers when they cross the Øresund Bridge, aboard ferries, and in service areas. The Swedish police said they had contacted European intelligence agency Europol for further information about the road pirates. ‘We suspect they are criminal gangs from the former Yugoslavia,’ said Per-Arne Nilsson from the police in Mölndal, which is in charge of coordinating the Swedish effort against the robberies.