A gang of men burst into a house in Rosemount on Sunday (March 29) before shooting a man in the leg.
The 20-year-old man was shot in the right knee in the house in Osborne Street.
A gang of three men are thought to have been involved in the incident at about 11pm. They broke into a house and two of them ran upstairs where they shot a man in his right knee. He was taken by ambulance to Altnagelvin Hospital.
Another man and a woman who were also present in the house at the time were held at gunpoint in a downstairs room by one of the gang.
Information can be given by contacting the non-emergency number, 101. Alternatively, callers who do not wish to disclose their details can call the Crimestoppers charity anonymously on 0800 555 111.