A woman suffered serious facial injuries during an incident at a house in Gaywood at the weekend.
A 47-year-old man has been arrested and bailed in connection with the incident, which is said to have happened at an address in Bishops Road, Gaywood between 3pm and 8pm on Sunday.
And detectives yesterday appealed for anyone who may have seen a man acting suspiciously in the area during that period to come forward.
A Norfolk Police spokesman said the incident involved a man and woman who were known to each other.
The woman, who is in her 40s, had to undergo surgery on her injuries.
Anyone with information about the incident is asked to contact Det Con Emma Cross, of Lynn CID, via the non-emergency 101 number.