The train that derailed in Switzerland was carrying around 200 people between Tiefencastel and Solis, according to a statement from the cantonal police department.
The statement said that a rescue and evacuation operation is in process involving the air-rescue and ambulance services, firefighters, Alpine Rescue and police.
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The Islamic centre where the Manchester suicide bomber is thought to have prayed says the attack "has no place in Islam or any religion".
German chancellor Angela Merkel and Indian prime minister Narendra Modi among those to praise "great spirit" of Manchester people.
The bomber's identity has been confirmed by Greater Manchester Police.