Investigators suspect fire was result of deliberate act after reports that someone onboard doused themselves in petrol

Police investigating a bus fire that killed at least six people in western Switzerland have said they suspect a deliberate act by a person onboard but so far have not found any evidence of a terrorist motive.

The vehicle, operated by a service that transports passengers and mail, went up in flames on Tuesday evening in Kerzers, a town of about 5,000 people about 12 miles (20km) west of the capital, Berne, in the canton of Fribourg.

Frédéric Papaux, a spokesperson for Fribourg police, said investigators were following up on reports someone on the bus had doused themselves in fuel and set themselves on fire.

“At this stage, we have evidence suggesting a deliberate act by a person who was inside the bus,” said Papaux.