Switzerland's Office of the Attorney General has started criminal proceedings in connection with the Berlin Christmas market lorry attack which left 12 people dead.
The proceedings are based on suspected support of a criminal organisation and a violation of the country's ban on so-called Islamic State and Al-Qaeda.
However, the proceedings are against "unknown", which implies the authorities do no know precisely who, or how many people, could be involved.
A 34-year-old woman has died and two girls are in a serious condition a day after being attacked on a Swiss train by a man armed with a knife and flammable fluid, police said.
The suspected attacker also died of his injuries, police said.
The girls, aged 6 and 17-years-old are in serious condition.
Five people were stabbed or burned during the attack by a 27-year-old Swiss man on the train nearing the Salez station on a trip between Buchs and Sennwald in St Gallen.
"The motive remains unclear," police said in a statement. "There is currently none that can be found."
Seven people have suffered burn and knife wounds in an attack on a Swiss train, according to St Gallen police.
The suspected attacker, described as a 27-year-old Swiss man, reportedly set fire to a train in northeastern Switzerland after igniting a flammable liquid.
He then attacked passengers with a knife. A six-year-old child was among the injured, along with three women and two men.
A police spokesman said the possibility of a crime of passion is not being excluded, but ruled out terrorism as "very, very far-fetched".
The suspect was taken to hospital and a major police operation is underway.
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Voters in Switzerland have rejected a proposal to introduce a guaranteed basic income for all citizens, with around 78% voting against, projections by the GFS polling group for Swiss broadcaster SRF showed.
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