Petrol bombs, a hatchet and masonry were among items thrown at police during a third consecutive night of disorder in Ballymena.
Another nine officers were injured, but not seriously and were able to remain on duty, police said.
Officers responded with water cannon, dogs and plastic baton rounds in an attempt to disperse crowds in the Co Antrim town.
Unrest spread to other towns on Wednesday, including Coleraine and Larne – where the leisure centre was set on fire by masked vandals who also smashed windows.
ITV News speaks to the President of the National Black Police Association Andy George on the riots that happened in Ballymena.
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