Police are appealing for witnesses to the assault, which happened between 9am and 11am on Tuesday, May 9.
A man has reported being assaulted by two or three unknown men near the church on Hillington square.
The victim sustained injuries to his face and ribs which required hospital treatment.
Officers are keen to hear from anyone who was in the area at the time, who saw the assault.
Anyone with information should contact Det Con Larissa Foreman at Kings Lynn police station on 101.
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