An investigation into a knife attack that left a man with serious injuries has been closed despite CCTV being released as part of an appeal.

Police began enquiries when a man was attacked with a knife on Hall Road in Norwich on March 22 this year.

The area was sealed off as officers launched investigations into the alleged attack which happened at around 11.30pm.

An appeal was launched for information into the incident.

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As part of efforts to trace people linked to the incident police released CCTV footage of a man they wanted to speak to in connection with the incident.

But after six months police have now said the investigation has been closed.

They have not revealed whether the man seen in the CCTV was ever traced.

A spokesman said: "All lines of enquiry have been exhausted and the case has been closed. Of course, we would always review any new information provided to us.”

Anyone who still has information can contact police on 101 quoting crime number 36/20821/23.

Alternatively, contact Crimestoppers anonymously on 0800 555 111.