Officers are investigating a report of a man and woman being assaulted at a bus stop in Worthing.
The incident happened at about 3.30am on October 30 in Brighton Road, shortly after they had alighted from the Stagecoach 700 bus near the junction with Windsor Road.
It was reported that there was an altercation on board the bus involving other passengers on board, including some men dressed in fancy dress with white laboratory coats.
One suspect was described as being a skinny white man in his early 20s, 6’, with blond hair that was curly on top.
The second suspect was described as a slim mixed-race man in his early 20s, 5’5”, with short dark hair.
A third suspect was described as a slim white man in his early 20s with short brown hair, shaved at the sides.
Officers have pursued lines of enquiry as part of the investigation, and police want witnesses or anyone with information about what happened to come forward.
Anyone with information should report it to Sussex Police online or call 101 and quote serial 266 of 30/10.