A knifeman has set fire to a train in north-eastern Switzerland, leaving six people in hospital with stab wounds and burns, police say. 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. 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. Some of the injured are said to be in a serious condition.

The attacks happened in Salez, North-Eastern Switzerland near the border with Liechtenstein.

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Three rescue helicopters are at the scene. A major police operation is under way. European states have been on the alert for "lone wolf" attacks after a series of recent incidents.

Last month, an Afghan asylum seeker attacked passengers on a train in the neighbouring German state of Bavaria with an axe, injuring four people.