Baton rounds have been fired and water cannons deployed by police on rioters as violence over the Union Flag flared up in Belfast for the fifth successive night.
It came after hundreds of loyalists staged a mainly peaceful protest at Belfast City Hall.
As around 250 demonstrators from east Belfast returned from the city past a volatile community interface, disorder struck.
In the last five weeks, around 100 people have been arrested, with more than 60 police officers have been injured in flag-related unrest.
Twenty-nine police officers were injured during sectarian riots between republicans and loyalists in east Belfast today.
The union flag will be raised at dawn over Belfast City Hall for the first time since the dispute began last month.
Police were attacked for a third night, with frontline officers reportedly coming under gunfire as new loyalist trouble erupted in Belfast.