The attacker was also taken to the hospital after the incident.
A knifeman has set fire to a train in north-eastern Switzerland, leaving six people in hospital with stab wounds and burns, police say.
The suspected attacker, described as a Swiss man aged 27, was also taken to hospital after the incident near Salez in St Gallen Canton.
He had ignited a flammable liquid before attacking people with a knife.
Among the injured is a child of six. There was no immediate information as to motive or background.
Three rescue helicopters are at the scene. A major police operation is under way.
The attack occurred around 14:20 (12:20 GMT) as the train was approaching Salez station, between the towns of Buchs and Sennwald.
Several dozen passengers were on board at the time of the attack.
Apart from the child, a girl and a boy, both 17, two women aged 34 and 43, and a man aged 50 were hurt.
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