Police used water cannon in Belfast after a second night of violence triggered by a knife attack.
Small groups threw stones and bottles, lit fires and clashed with officers.
British authorities blamed far-right activists for spreading anger online.
Parts of Belfast were shut down, with schools, businesses and public transport disrupted.
Three people were arrested in Northern Ireland and three others in Glasgow after separate clashes.
A 30-year-old Sudanese refugee has appeared in court accused of attempted murder over the stabbing.
The victim’s family appealed for calm and warned against using the attack to spread hate.
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