British Transport Police
The passenger was alerted by another woman.
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No injuries were reported and the incident is not believed to be terror-related.
He was taking his 14-year-old son on a trip.
The 35-year-old suspect has been held following a manhunt.
Counter-terror detectives are scouring the home of the suspect.
One witness said they heard the assailant shout “Allah”.
"I just heard this most blood curdling scream," said one witness.
The British Transport Police said it was aware of the incident and was making enquiries.
The alleged incident happened in August.