A man in his 30s remains in hospital for treatment for stab wounds to his stomach.
It follows an incident on Bolingbroke Road last Wednesday.
Officers arrested a 45-year-old man and 48-year-old woman on suspicion of assault occasioning grievous bodily harm the following evening, 14th May.
They were questioned at Wymondham Police Investigation Centre and released on bail until 9th June.
An investigation into the incident is ongoing and detectives are appealing for anyone with information, dash cam or CCTV footage to come forward.
If you can help, contact 101 or call Crimestoppers anonymously on 0800 555 111.