A woman was allegedly assaulted following an altercation with another woman at the Savoy Cinema in George Street, Corby.
The 18-year-old victim was at the cinema with her partner when she was approached by a woman who was verbally abusive towards her.
At the end of the film the woman allegedly approached the victim again, when she grabbed and assaulted her, causing scratch marks to her neck.
Two people have been interviewed in connection with the incident. However, officers are continuing to appeal for witnesses, particularly anyone who was at the Savoy between 9pm and 10pm on Sunday, 3 April.
Anyone with information is asked to contact Northamptonshire Police on 101 or, alternatively, call the independent charity Crimestoppers anonymously on 0800 555 111.