An 18-year-old boy who was taken to hospital with a deep cut to his ear was attacked just moments after getting off a late-night bus.
The boy got off the S5 bus at Bicester, having travelled from Oxford, but was attacked in Pioneer Square.
He was taken to hospital and needed treatment for the deep cut to his right ear.
It happened around 4am on Saturday November 8, 2014 but police would now like to speak to the men captured on CCTV.
If you have any information which could help with the investigation, contact Det Con Mark Personius on 101.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.