Police in Londonderry are searching for a gang they believe may be linked to two assaults over the weekend.
The assaults took place in the Waterside area of the city in areas on either side of the Altnagelvin hospital.
In the first assault the three men attacked a small group of people in the Knockwellan playing fields area at about 9pm.
The attackers were described as being in their mid teens and one was believed to be wearing a Tottenham Hotspur top.
The next assault then took place in the Knightsbride area.