Teenage woman chased through tunnel and attacked
The woman was dragged to the floor and grabbed between the legs as she screamed for help and tried to lash out.
The 19-year-old was walking through a train station subway in Islikon in canton Thurgau.
At around 10:30pm the woman was grabbed and immediately screamed loudly for help.
Trio tackled the man and held him until police arrived
Three people noticed the struggle and went to help her.
The trio managed to detain the attacker until the police arrived.
A Sudanese man, aged 25 was arrested at the scene.
The victim fought her attacker and screamed for help
A criminal investigation in Frauenfeld has begun.
Security services have grown increasingly concerned by the rising number of sex attacks by gangs of migrants which appear to be spreading across Europe.
Cologne: Sex Attacks and Robberies
Tue, January 12, 2016
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Thirty-one suspects, including 18 asylum seekers, are under investigation over offences including sexual assault and theft in Cologne on New Year's Eve. Far right protestors in Lepzig have rallied against refugees and German chancellor Angela Merkel.
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Attacks in Switzerland have been reported across European news
In 2016 attacks were reported in Salzburg and Zurich, after mass assaults in Cologne and across Germany.
More than 100 women reported attacks on New Year’s Eve 2015/16 in the centre of Cologne when they were surrounded by men and groped.
In Lucerne, Switzerland leaflets were handed out in January 2016, warning migrants to respect women and children and avoid violence.