Loyalists look set to delay plans to stage a rally in Dublin in protest at the lowering of the Union flag above Belfast City Hall.
Organisers claimed police in the Republic's capital wanted more time to make security arrangements for the demonstration, which is due to take place outside the Irish Parliament on Saturday.
Although there was no announcement of a definite decision, Willie Frazer of the so-called Ulster People's Forum whose supporters have been heavily involved in the unrest and disruption in Belfast since the beginning of last month, said: "The Garda want to facilitate this protest and we are prepared to work with them. But they said they need more time."
With loyalists threatening no let up, the Prime Minister said he was willing to have talks to discuss the continuing disorder. But he also insisted it was up to the parties to play their part as well.
The Prime Minister told the Commons: "We need to build a shared future in Northern Ireland where we break down the barriers - barriers of segregation that have been in place for very many years. I think that is part of the challenge to take away some of the tensions we have seen in recent days."
Many traders in Belfast, especially bar and restaurant owners, whose profits plunged because of the trouble in the run up to Christmas and New Year, are planning to withhold rates in protest.
Demonstrations brought the city centre to a virtual standstill leading to wholesale table cancellations and disastrous sales figures.
Dublin businesses also fear trouble if Saturday's protest goes ahead.