A violent assault on a commuter train in London has raised fresh safety concerns for transit riders across Canada and the United States.
The incident happened at Cricklewood railway station in the early afternoon of July 28, when a man was allegedly approached on the platform by another man who was repeatedly swearing.
Both men later boarded a train towards Sutton, where the alleged verbal abuse continued.
The man then reportedly pushed the victim, scratched his arm and spat at him.
A fellow passenger who attempted to intervene was also spat at.
British Transport Police appeal
British Transport Police have released an image of a man they would like to speak to following reports of the assault.
Police have now released an image of a man they believe may have information that could assist their investigation.
Anyone who recognises him is asked to text BTP on 61016, or call 0800 40 50 40, using the reference 286 of 28 July.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
Implications for Canadian transit
Transit agencies in Toronto and Vancouver have recently warned riders about aggressive behaviour on trains, and they encourage the public to report any suspicious activity, mirroring the call from London authorities.