Police in Northern Ireland fear violence on the streets could escalate after blaming both Republican and Loyalist groups of leading the trouble.
Dissident republicans are suspected by police of firing live rounds in Belfast which injured a press photographer in the leg on Tuesday night.
Two other men suffered bullet wounds amid two nights of violence in the city.
Senior officers have said the Ulster Volunteer Force (UVF), the loyalist paramilitary group, started the rioting on Monday.
Petrol bombs, bottles and bricks have been thrown at officers in the worst violence the city has seen for 10 years.
Pitched battles were fought between loyalists and republicans at a notorious flashpoint in the east of the city. Police were targeted as they tried to restore calm. (read more)