Police have been attacked with petrol bombs in north Belfast during a second night of trouble.
It follows serious rioting on Friday night when 32 police officers and an MP were injured.
Clashes developed after police stopped a march by loyalists - who want the country to remain part of the UK - passing through a nationalist area of the city, where many people want to be part of the Republic of Ireland.
An additional 400 police officers from around the UK have been brought into Northern Ireland to help calm down the situation.
You can find out more about the history of Northern Ireland in our guide.