STAFF and revellers needed medical treatment after a noxious spray was discharged in a Mansfield bar and adjoining nightclub at the weekend.
The incident happened at around 1.30am on Saturday at the Rush bar and neighbouring Illusions nightclub on Clumber Street
Police say they believe the substance was CS or pepper spray.
A 19-year-old woman has been arrested in connection with the incident and has been bailed pending further enquiries.
The incident may be linked to a similar one at the Squinting Cat pub in Clipstone shortly after midnight on Saturday.
Anyone with information should contact police on 0300 300 99 99, ext 805 3442.