Rioting broke out across Belfast after hundreds of loyalists took to the streets to protest over flags.
Eight police officers were injured after mobs of youths draped in Union flags clashed with the Police Service of Northern Ireland riot squad close to the city centre last night.
A further six officers were injured as they dealt with disorder near Crumlin Road and Ligoneill Road.A total of 12 people have been arrested, including a 13-year-old boy.
Trouble flared at Shaftesbury Square - a popular party spot near Queen's University - after a man tried to drive a black van through a loyalist road block of about 200 people.
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A top temperature of 11 Celsius (52 F).
The event, which was held at the Dorchester Hotel last Thursday, was attended by representatives of some of Britain’s biggest companies.
Reports in the Daily Mail and the Telegraph said published guidance has been changed for 2018 to only fly the Union flag on Remembrance Day.