Two women were assaulted in separate incidents in Luton town centre in the early hours of Sunday.
Now detectives are appealing for the second victim to come forward after arresting a man.
The first incident happened between 3.20am and 3.50am after officers were called to MacDonald’s in George Street where a 19 year old woman had been assaulted and suffered facial bruising.
The offender had left the scene and it is believed assaulted another woman outside the BHS store before being arrested.
DC James Wildman, investigating, is urging the second victim to come forward.
DC Wildman said: “Officers arrested a 20 year old man from Luton in connection with this incident and he has been released on police bail pending further investigation.
“In order to further this investigation we need to trace the second victim or anyone who witnessed this incident and I would urge them to contact officers as soon as possible.”
Call Bedfordshire Police on 101, or text information to 07786 200011.
Alternatively you can contact the independent crime fighting charity Crimestoppers, anonymously, on 0800 555 111.