Loyalists resumed their protest action over the Irish Sea border on Monday evening.
A march took place from the West Winds estate in Newtownards, Co Down to the town's police station, with protestors holding anti-Northern Ireland Protocol signs.
Loyalists claim the protocol has undermined the region's place within the Union.
Several hundred people attended the march in Newtownards, and it was one of a number of similar demonstrations in the North Down area on Monday evening.
Meanwhile in west Belfast, furniture was set on fire in the middle of the Shankill Road - close to where a bus was set alight earlier this month - during a fresh episode of trouble.
Police attended the scene and came under sporadic attack while monitoring a crowd which gathered on the loyalist side of the nearby peace line.
Calm had been restored to the scene by around 9pm.
Earlier on Monday, the brother of a paramilitary murder victim disrupted a loyalist protest against Brexit's Northern Ireland Protocol.
Gareth McCord interrupted the small demonstration outside Irish government offices in Belfast organised by the Loyalist Communities Council - an umbrella group representing loyalist paramilitaries.
Mr McCord's brother Raymond was beaten to death by a Ulster Volunteer Force gang in north Belfast in 1997.
Holding a picture of his brother, he confronted LCC chairman David Campbell only moments after he and former Ulster Unionist MLA and UKIP NI leader David McNarry unfurled an anti-Protocol banner outside the Irish Secretariat offices.
Mr McCord mocked the size of the protest and claimed it demonstrated that the LCC had no support within loyalist communities.
"Nobody wants you, clear off," he said.
A police officer intervened during the exchanges and urged people to respect Covid-19 regulations and guidance.
On Sunday evening, banners similar to one displayed by Mr Campbell and Mr McNarry were erected in several loyalist areas in Northern Ireland.
The banners accuse the UK and Irish government, the European Commission and the US administration of not listening to loyalist concerns, and warn that politicians face a choice between the Good Friday peace accord of 1998 and the Protocol.
Earlier this month, rioting broke out in a number of working class loyalist areas across Northern Ireland.
Mr Campbell said all protests should be peaceful.
"There are other individuals making similar peaceful symbolic protests today throughout Northern Ireland, in London and in Dublin itself and we hope that conveys a message to anyone who is seeking violent protest to stay at home - you're not assisting our cause," he said.
Mr McNarry insisted the size of the protest at the Irish Secretariat reflected the public health situation.
"Had this been normal times David and I would have been two of a hundred thousand people on the street today and on the streets on many nights, peacefully protesting and asking for our rights to be acknowledged," he said.
Loyalist anger at the Protocol has been cited as one of the main factors behind the violence that erupted earlier this month.
Another was the decision not to prosecute 24 Sinn Fein members for Covid-19 breaches after they attended a mass republican funeral during the pandemic.
There are also more long-standing concerns held by some loyalists that they have missed out on the gains of the peace process in areas such as jobs, investment and housing.
Nationalists reject the contentions and insist their communities experience just as many problems with poverty.