UK Prime Minister Keir Starmer said the “appalling” incident was “deeply concerning”.
“My thoughts are with all those affected, and my thanks go to the emergency services for their response,” Starmer said in a statement on X.
“Anyone in the area should follow the advice of the police,” Starmer added, while his interior minister Shabana Mahmood confirmed two people had been taken into custody.
“MULTIPLE PATIENTS”
Armed police were at the scene after being alerted around 7.40pm (1940 GMT) just after the train had left the town of Peterborough.
Late Saturday, police were inspecting the train, which was being treated as a crime scene. People were also led away outside the station in space blankets, an AFP photographer saw.
The East of England Ambulance Service said on X that it had mobilised a “large-scale response” to Huntingdon station, including ambulances, air ambulances and tactical commanders.
Train operator London North Eastern Railway (LNER) said railway lines were closed while emergency services dealt with the incident.
LNER, which runs trains along the east of England and Scotland, urged passengers not to travel, warning of “major disruption” with the lines blocked in the area.
The mayor of Cambridgeshire and Peterborough, Paul Bristow, said on X that he was aware of “horrendous scenes”, adding that his “thoughts and prayers (are) with everyone affected”.
The identity of the two people arrested was not immediately known, nor was the motive for the attack.