A teenage boy has reportedly "physically assaulted" a man in his 20s in Borehamwood.
The incident took place between 3.15pm and 3.30pm on Tuesday (July 11).
The two individuals had been travelling on the 292 Metrolink bus, when a "verbal altercation" took place between them.
The duo exited the bus on Gateshead Road, before the older male was "physically assaulted".
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No injuries have been reported.
PC Laura McLaughlin said: "Our enquiries are continuing, and I am urging anyone with information to please get in touch.
“Were you travelling on the bus at the time and saw what happened, or do you have any other information that could assist our investigation?”
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PC McLaughlin can be contacted via email at: laura.mclaughlin@herts.police.uk
Information can be reported online at herts.police.uk/report, or by calling the non-emergency number 101.
Anonymous information can be given by contacting Crimestopppers on 0800 555 111 or via crimestoppers-uk.org.
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