Gun shots were fired in Wauluds Bank Drive in Marsh Farm on Saturday afternoon (February 23).
Witnesses reported seeing four youths being approached by two men on an off-road motorcycle before a chase towards the underpass at around 4pm.
Loud bangs were heard but no witness has been able to confirm whether a firearm was used, and forensic teams have found no evidence a weapon was discharged.
CCTV cameras have identified a number of people who were in the area at the time of the incident and detectives are keen to speak with anyone who may have information.
Anyone with information relating to this incident can contact Bedfordshire Police on 101, in confidence, or text information to 07786 200011.
Alternatively, you can contact the independent charity Crimestoppers, anonymously, on 0800 555 111.