A 20-year-old man had to have surgey on his leg after he was stabbed in The Galaxy Centre on Wednesday (February 20).
The incident happened at about 9.20pm when it is believed the victim was assaulted by a group of men outside The Gym in the centre.
All the men were described as black and wearing black clothing.
Police officers attended the scene and the victim was taken to the Luton and Dunstable Hospital where he remains in a stable condition after the surgery.
Det Con Mohammed Hussain said: “The victim is now recovering in the hospital and we need to trace people who were in the area to help with this investigation.”
Anyone with information relating to this incident can contact Det Con Hussain, in confidence, at Luton Police Station on 01582 394067, or Bedfordshire Police on 101, or text information to 07786 200011.
Alternatively you can contact the independent charity Crimestoppers, anonymously, on 0800 555 111.