Three men and a woman were arrested after trouble following an anti-internment parade in north Belfast on Sunday.
Petrol bombs, stones and bottles were thrown at police after they stopped the parade entering Belfast city centre.
The march was stopped by police at Oldpark Road in the north of the city after it breached a determination by a parades ruling body over its timing.
Organisers had asked supporters to leave peacefully when the parade ended.
But police were forced to deploy water cannon about an hour later when a crowd threw missiles at them.
On Sunday night police said they would “now review the evidence gathered and pursue all relevant lines of inquiry relating to any offences or breaches of the Parades Commission determinations”.