The UK's Northern Ireland minister said talks had so far failed to overcome a dispute about a Protestant parade through a mainly Catholic area, France 24 reports.
Tensions escalated in Northern Ireland after police blocked a third attempt by loyalist marchers to proceed along a nationalist road, with talks expected to follow amid Sinn Féin involvement.
Thousands of protesters prevented a contentious parade from passing through Portadown's Garvaghy Road for the first time in nearly 30 years.
Talks are expected Monday after a court allowed an Orange Order parade along a contested route for the first time since 1998.
A renewed dispute over an Orange Order march along Garvaghy Road has revived memories of tensions that once brought parts of Northern Ireland to a standstill.
Thousands gathered to block a road ahead of the march, according to reports from the scene.
Hundreds of demonstrators, joined by Sinn Féin leaders, opposed a court-approved decision allowing the Orange Order to march the Garvaghy Road for the first time since 1998.
An Orange Order march is set to pass through the mainly nationalist Garvaghy Road in Portadown for the first time in nearly 30 years, amid protests.
Around 2,000 demonstrators blocked the route as tensions rose over a controversial parade approved by Belfast's High Court.
A Northern Ireland court has cleared a Protestant Orange Order parade to proceed through a contested route in a Catholic area for the first time in nearly 30 years, prompting counterprotests.
A court decision allowing a long-disputed Protestant parade through a Catholic area of Northern Ireland for the first time in nearly 30 years has raised concern that old tensions could resurface.
A crowd gathered on Garvaghy Road early Sunday to protest against a ruling permitting the march, according to Al Jazeera.
A crowd gathered on Garvaghy Road on Sunday morning to protest after a court ruled the Orange Order march could proceed, Al Jazeera reports.
A crowd gathered on Garvaghy Road to protest against a ruling allowing the march, Al Jazeera reports.
An Orange Order march through a nationalist part of Portadown will go ahead on Sunday after a court overturned a near three-decade injunction.
The Orange Order will be allowed to march along Portadown's Garvaghy Road for the first time in nearly 30 years after an injunction against the parade was dismissed on appeal.
A high court judge urged all sides to step back after a bid to reroute a countermarch raised fears of sectarian violence in Portadown.