Police in Belfast have come under attack from loyalist rioters for a second night running.
Officers, who are calling the unrest "sporadic", responded by firing baton rounds and water cannons.
Trouble first flared on Friday when an Orange Order parade was stopped from passing the republican Ardoyne area.
Footage from a PSNI helicopter shows rioters attempting to punch and kick police Land Rovers:
Northern Ireland's Chief Constable has called in extra resources from across Britain.
Security analyst Brian Rowan says he has a tricky task:
