Specific details of the attack have not been released, but Surrey Police added:
Thankfully, incidents of this nature are rare in this area, however, Nutfield is a small, close knit community and no doubt this offence will have some impact on the residents but we will do all we can to reassure local people.
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The eagle-eyed resident spotted the mistake on signs just feet apart in south London.
The victim was attacked after bumping into a man at the ticket barrier at Putney Station.
The victim, who is his 40s, was found near the edge of palace grounds.