Police in the capital of Northern Ireland Belfast were attacked for the eighth night in a row on Friday.
The violence took place mainly in the northern parts of the city, writes Belfast Telegrpah.
In the Tiger's Bay area, groups of young people threw stones and homemade petrol bombs at police and set fire to debris placed on roads.
Police in other parts of Northern Ireland, including Coleraine, were also attacked on Friday.
At least 50 police officers have been injured in the violence of recent days.
The attacks have been condemned by representatives of several parties in Northern Ireland and call on those behind the violence to stop the attacks.
However, the country's Deputy Prime Minister Michelle O'Neill fears that the weekend may continue to be marked by violence.
"I hope and urge all young people not to be dragged along, not to be exploited or manipulated in any way, stay away from the streets and stay at home in safety," O'Neill said in a statement.
The background to the unrest is largely due to a new Brexit border that has rekindled the protracted conflict between unionists loyal to Britain and Northern Ireland nationalists.
Recently, several members of the nationalist party Sinn Féin also attended a funeral that violated corona laws, but escaped prosecution, which has fueled further controversy.