Whanganui Police are investigating an assault which happened on Sunday morning at Queen's Park in Whanganui.
At about 1am a 17-year-old man was assaulted by another man while walking along the path between the War Memorial Hall and the Whanganui City Library.
He was knocked to the ground and required medical treatment.
Police say the assault was likely witnessed by members of the public as it was close to the War Memorial Hall and would like to hear from anyone who did or was in the area at the time.
Anyone with information relating to this case can contact Constable Michelle Evans of the Whanganui Police on 06 349 0600.
Alternatively, anonymous information can be reported to Crimestoppers on 0800 555 111.