Three people were attacked by a man and a woman who were arguing on the tube.
The victims were travelling from Amersham to Harrow-on-the-Hill on February 13, at 12.30am, when they heard a man arguing with the woman he was with.
In an appeal launched by the British Transport Police, it is said they looked at the pair, which provoked the man as he “responded aggressively”.
One person was punched and kicked, and the woman then got involved resulting in all victims being attacked.
According to police, one of the trio suffered bruising to the brain, and another with a broken ankle.
CCTV images of two people has been released, which could aid with the investigation.
Anyone with information is asked to contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 33 of 13/02/22.
Alternatively, contact anonymously through Crimestoppers on 0800 555 111.
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