Thames Valley Police is releasing CCTV images of three males officers would like to speak to as they may have vital information about a robbery in Milton Keynes.
The incident occurred at around 5pm on Saturday 7 January on the overbridge between Xscape and Fishermead.
The victims, two boys in their teens, were assaulted and had their belongings taken.
They sustained bruising and required hospital treatment but they have since been discharged.
Investigating officer Detective Constable Yvette Wray, based at Milton Keynes police station, said: “We would like to appeal to anybody who may know who the males in these images are, or if you are one of the males, to please get in touch as you may have vital information about this incident.
“You can get in touch by either making a report online or by calling 101, quoting reference number 43230009728.
“Alternatively, for 100% anonymity, you can also call the independent charity Crimestoppers on 0800 555 111.”