At least three people were killed and others injured in a train accident in the US state of Montana.

The railway company Amtrak announced via Twitter that the long-distance train with around 146 passengers and 16 crew members on board had derailed on Saturday afternoon (local time) near the city of Joplin and that injuries had been reported.

CNN and CBS News reported, citing the Liberty County Sheriff, that at least three people had died.

The "New York Times" reported, citing information from the authorities, that at least 50 people were also injured.

Photos from the scene of the accident showed that several wagons had tipped on their side.

Many passengers were taken to the nearby Chester high school, according to CBS News.

The train connects Chicago and Seattle.

According to Amtrak, the train consisted of two locomotives and ten wagons.

Of these, seven derailed.

Amtrak is working with local authorities to transport injured passengers and safely evacuate the others, it said.