The police prevented an early morning attempt by the Orange Order to make a controversial parade down a road which had previously been blocked by protesters.
A group of men tried to march from Drumcree Church down the mainly-nationalist Garvaghy Road in Portadown in the early hours of Monday but a line of police Land Rovers stood in the way.
They had been unable to make the permitted parade on Sunday morning because protesters had gathered on the Garvaghy Road. The stand-off continued throughout Sunday, with the Orangemen waiting at the church, around a mile from the road, for the go-ahead from police.
Sinn Féin First Minister Michelle O'Neill joined the protest, prompting Democratic Unionist Party leader Gavin Robinson to accuse her of acting unlawfully.
Northern Ireland Secretary Sir Chris Bryant called for "compromise".
Breandán Mac Cionnaith, from the Garvaghy Road Residents Coalition, said he was meeting the secretary of state and chief constable on Monday, and that he would not prejudge those conversations.
Nigel Dawson, who is the Orange Order's Portadown district master, told BBC News NI there was frustration.
He said they had a legal right to parade down the Garvaghy Road and the police should facilitate their route.
"We have been open and honest, and were seeking mediation to seek a resolution suitable to both sides that would bring this to a successful conclusion," he added.
Democratic Unionist Party (DUP) MP Carla Lockhart, who came back to Drumcree in the early hours of Monday, said the Police Service of Northern Ireland's chief constable needed "to take a grip of this very quickly or his position will become untenable".
The Drumcree parade, which in the 1990s sparked some of the most serious disorder in Northern Ireland's history, was due to go ahead for the first time in 30 years after a series of legal challenges.
Since 1998, the Orange Order had been banned from completing its Drumcree march - and until this year had been repeatedly refused permission to finish the route by the Parades Commission, which was set up to adjudicate disputes.
The Orange Order is a Protestant pro-British organisation, while the area where it wants to walk - specifically along the Garvaghy Road - is largely Catholic and predominantly inhabited by pro-Irish nationalists.
SDLP leader Claire Hanna, who also attended the protest, called for de-escalation and said: "Whatever the legalities, it was never politically right or morally right to do this."
Following talks at Hillsborough, her party called for an international mediator to help resolve the dispute, with Sir Chris saying he is "giving consideration to anything that anybody comes up with".
He said he is determined to keep on working and talking with people, but added that "we haven't got a solution yet".
Also speaking after the meeting, UUP leader Jon Burrows said the rule of law needed to apply to "everyone", and that Stormont has been "put under threat".
"It is vital that everyone obeys the law. I don't care who that is. I don't care how senior you are. The law applies to everyone. It cannot be enforced basically on the basis of it might be politically inconvenient," he added.
Justice Minister Naomi Long described the stand-off as an "entirely avoidable conflict" and said politicians risked delivering "misery" to the people of Northern Ireland.
The Orange Order, the most prominent of the loyal orders associated with Protestants in Northern Ireland, holds thousands of parades every year and the vast majority pass off without incident.
However, many Catholics see the marches as sectarian and object to them passing through, or close to, Catholic or nationalist areas.
The Garvaghy Road had been part of the Drumcree route, but by the mid 1990s nationalist residents protested against the parade. The row sparked some of the most serious public disorder in Northern Ireland's history and was linked to several murders.
The row reemerged after a court case in which a ruling by the Parades Commission - the organisation formed during the Drumcree dispute to decide on contentious marches during Northern Ireland's parading season - was overturned.
On Friday, following 28 years of unsuccessful applications, the commission decided the march could go ahead with restrictions in place.
Rather than start at 13:00 on Sunday as intended, the commission said it could begin no later than 08:00 and with 35 participants rather than the 60 the Orange Order requested.
However that decision was challenged in several Belfast courts on Saturday, before finally being given the go ahead just hours before it was due to take place.
