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Two Dartford men have been arrested after a group of passengers were assaulted and verbally abused on a train.
A group of men clashed with people on the Charing Cross to Dartford service when they were told to be quiet and stop using foul language.
British Transport Police said one passenger was threatened and assaulted.
Another two people were then subjected to homophobic threats and comments.
At London Bridge, the incident spilled over onto the platform and two Dartford men, aged 25 and 27, were arrested on suspicion of affray.
PC Alexandra O'Leary said: "We believe other people travelling on the service may have been threatened by these men, and that another passenger may have been assaulted during this incident.
"Although we have made arrests in connection with this incident, we know that there were people on the train who saw what happened, or who might even be victims themselves, who haven't come forward.
"This was an intimidating experience for the victims, as well as other passengers on the train, and it is vital we speak to as many people who witnessed what happened as possible.
"I would urge anyone who has any further information about this incident to come forward as you could really help us with our investigation."
The arrested men have now been released on police bail until September, pending further inquiries.