PSNI Assistant Chief Constable Will Kerr appealed for calm as the Belfast protest over Union flag restrictions passed into the evening without major incident.
Earlier a driving school car was set alight in the east of the city and a policeman injured in a separate incident was taken to hospital. A 15-year-old youth and a 32-year-old man were arrested during the protest, police said.
ACC Kerr said: "Those involved in the protest should reflect on their own responsibility for any associated disorder and violence. I am appealing for calm as the day progresses. There have been too many nights of disorder across Northern Ireland and now is the time to move forward."
More top news
Bournemouth will effectively win promotion from the Championship to the Premier League if they beat Bolton at home on Monday.
Thousands have fled Burundi as violent protests against the president's decision to stand for a third term break out, leaving five dead.
Once a fringe party, the SNP has become a thundering political juggernaut that shows no sign of slowing down.