Swiss train operator Rhätische Bahn has confirmed that one if its trains had derailed.
The company tweeted that some carriages have left the track. The derailment has happened near Tiefencastel in the east of the country.
At the moment there is no information about casualties. Rescue organisations local police and representatives from the rail company are at the scene.
Bei Tiefencastel sid wegen einer Rüfe einige RhB-Wagen entgleist, keine Infos zu Verletzten. Rettungsorganisationen vor Ort. Infos folgen.
More top news
It will be a mainly dry but chilly start across the UK with a few showers across northern Scotland and northwest England.
Marks and Spencer will become the first UK retailer to add vitamin D to its entire packaged bread range.
An over-the-top 80's action movie parody featuring kung fu Hitler and a David Hasselhoff soundtrack gets almost four million views online.