A man was treated in hospital after being assaulted at the back of a pub in Ballinamallard.
The 21-year-old was attacked at around 3.50pm in the Main Street area of the Co Fermanagh village on July 12.
Police said his injuries are not believed to be life-threatening.
Two 18-year-old men and a 16-year-old boy were arrested and later released on bail pending further inquiries.
Anyone with more information has been asked to contact police on 0845 600 8000.