A train accident in the US state of Montana killed at least three people and injured several passengers on Saturday around 4 p.m. (local time), authorities said.

People who were detained shortly after the derailment have all been removed from the train, a police official said.

It is not yet clear how many people were injured.

The New York Times

reports that local emergency services coordinator Amanda Frickel said in an interview that at least 50 people were injured.

According to

CBS News

, many passengers have been transferred to a nearby school.

The train derailed for unknown reasons just outside the town of Joplin, more than 300 kilometers north of the capital Helena of Montana.

On board were roughly 147 passengers and 13 crew members, Amtrak said in a statement.

Amtrak is working with local authorities to transport injured passengers and safely evacuate all other passengers.

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