A bus caught fire in a town west of the Swiss capital, killing at least six people and severely injuring three others, police said Tuesday. Police spokesperson Frederic Papaux of Fribourg canton, or region, said an unspecified "voluntary act" could have caused the fire Tuesday evening in the town of Kerzers, about 15 miles west of Bern, the capital. The regional transport bus is operated by PostBus, which is affiliated with the national postal service. Images from the scene on Swiss media showed flames tearing through the bus, the AP reports.
"After rushing to the scene, rescue teams noted that the vehicle was totally engulfed in flames," the regional government said in a statement. Ambulance and helicopter teams ferried three injured people with severe injuries to hospitals, while two others were treated on site, police said. Papaux said at least six people were killed. "The police are currently treating the fire as a man-made incident, and even a deliberate act," he said, per the Guardian. No other vehicles were involved. It's not clear how many people were on the bus at the time.