PSNI officers were attacked by stone throwers in the North last night.
Fire crews were attacked as youths blocked and set a road alight in Killyleagh, Co Down, overnight. Damage was caused at Cross Street where the disturbances were centred.
Elsewhere, violence flared in Armagh when revellers spilled out of city centre pubs after midnight. Large crowds gathered and began hurling a rocks and other missiles in a two-hour attack on police.
One officer was slightly injured as the force attempted to restore order at the Moyle Road roundabout area.
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Seven people, including one juvenile, were arrested and later released by police.