The PSNI and members of the public have come under attack by a violent republican mob in the Lecky Road area of Londonderry.
The attack came close to the site of a republican bonfire due to be held in the area tonight.
Petrol bombs, bottles and bricks were thrown during the republican rioting.
Over 2,000 people attended the pro-terror event last year and yesterday masked republicans were photographed menacingly prowling the area.