"Having viewed the CCTV from the train, the actions of the member of rail staff were nothing short of heroic and undoubtedly saved people's lives," a BTP spokesman said. The suspect, a black British man from Peterborough, boarded the London North Eastern Railway (LNER) train at the city's station, the force said.

One individual remained in custody Sunday after two were arrested in connection with the stabbing attack. The other was released without charge, British police said.

Cambridgeshire police are reviewing three further incidents, including the stabbing of a 14-year-old in Peterborough, to establish whether there is a connection between them and the Huntingdon train attack.

A 32-year-old man has been charged with 10 counts of attempted murder after multiple people were stabbed on a train. Anthony Williams, from Peterborough, was arrested after the attack on an LNER train from Doncaster to London King's Cross,