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British Transport Police (BTP) said on Friday it was responding to reports of a collision involving two trains about 60 miles north of London, with media reports saying the major incident had resulted in multiple injuries.
A video posted on social media showed what appeared to be the front of one train entangled with the back of another, with both still on the tracks.
The East of England Ambulance Service said it had sent multiple resources, including an air ambulance, to the collision on the railway south of Bedford, and urged people to avoid the area.
Transport minister Heidi Alexander said in a post on X she was “deeply concerned” by reports of the collision.
