At least four blast bombs and several petrol bombs were thrown at police in the Lower Newtownards Road area of east Belfast.
There were no reports of any injuries. Water canon was deployed and one plastic bullet fired by police.
Earlier on Monday a pipe bomb was thrown at police from the Ardoyne area of north Belfast.
The device was thrown from Brompton Park at officers policing Crumlin Road at about 5pm. It exploded close to police but there were no reported injuries.
Meanwhile stones and other missiles were being thrown at police at Broadway and Glenmachen Street.
In Londonderry police dealt with a number of "white line" protests on the main Glendermott and Limavady roads in the Waterside area of the city.
Up to 90 people were involved in the protests, which were peaceful, between 7 and 8pm. Police said minimal disruption was caused to traffic.
During the protests police seized around 20 paint bombs believed to have been stashed by local youths.
Commenting on the pipe bomb attack in Ardoyne, Superintendent Emma Bond said: "We consider ourselves extremely fortunate that we are not dealing with a much more serious incident and that all of the officers were able to walk away from that situation unharmed.
"We have appealed for calm in the area and I continue to to do so. I would appeal to anyone with influence in the community to exert it to ensure that the next few days pass off without incident.
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