Two men were arrested over the weekend after passengers overheard them talking about knives.
BTP officers boarded a train at Wimbledon station at 5pm on August 10 following a report of two men discussing carrying knifes and theft.
One of the men, aged 24, was detained at the scene and arrested on suspicion of possessing a knife and theft.
The second man, also 24, fled onto the train tracks. He was found in nearby Cromwell Road and was arrested on suspicion of trespass.
Both have been released while officers carry out further enquiries.
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