The commission said not enough extra information was provided to justify a review of the marches on the Springfield and Crumlin Roads.

There are disputes over a number of parades in Belfast on Friday - the Twelfth of July - which is the biggest day in the Protestant marching season calendar.

The Parades Commission hopes that over the next two days those parading and their supporters will show respect to their host communities

Parades Commission

A delegation from Sinn Fein met the commission on Thursday.

It asked the commission to review its decision to allow two contentious marches to pass through nationalist areas.

Minor changes

The parades along the Springfield Road in west Belfast and the Crumlin Road in north Belfast have led to serious disturbances in the past.

The commission also issued a number of other determinations on other marches and called for respect and tolerance to be shown over the next two days.

It upheld its previous determination on the City of Derry Grand Orange Lodge with minor changes and clarified the route of another parade in the city.

I'm aware that there is concern and worry out in our community and that there is perhaps a dangerous of cocktail of circumstances out there

Alex Maskey Sinn Fein

The commission lifted conditions on a band parade in Newtownstewart in County Fermanagh, but declined to review the parade in Kilrea, County Londonderry.

"The Parades Commission hopes that over the next two days those parading and their supporters will show respect to their host communities and that those communities will demonstrate tolerance and respect of the traditions of the parades," it said.

Speaking earlier on Thursday, Belfast Lord Mayor Alex Maskey appealed for calm ahead of the Twelfth marches.

"I'm aware that there is concern and worry out in our community and that there is perhaps a dangerous cocktail of circumstances out there," he said.

The executive officer of the Orange Order, George Patton, said he was confident Orangemen would be calm and sensible during all the parades.

He said they had no interest or desire to be involved in anything that would create problems.

"We need to look at those who might be wishing to engage in violence," he said.

"I think it is important that they don't do that. I suspect that nothing that we can say or do will have impact on people who are determined to try and interfere with the parade or to attack it."

Deputy First Minister Mark Durkan said people should be "measured and mature in how they conduct themselves".

"I don't believe people have any excuse for trying to ratchet things up," he said.

Culture Minister Michael McGimpsey hit out at anti-Agreement unionists, accusing them of hijacking and destroying any sense of pride in loyalist culture.

He said constant criticism of other unionists at Orange events did nothing to promote a sense of purpose among the Protestant population.

"The 12th of July is one of the biggest cultural festivals anywhere in Europe - it is an event which is all about colour, spectacle, excitement and enjoyment," he said.

The minister warned: "I think this year, the whole of the Orange culture and Orange Order are very much on camera as far as the outside world is concerned and I think people need to be aware of that."

'Scenes of violence'

Meanwhile, North Belfast Democratic Unionist MP Nigel Dodds has met police chiefs to seek assurances about security surrounding marches.

"I am anxious that police have enough resources to deal with any eventuality as quickly as possible," he said.

"They must ensure the rights of law abiding citizens to live and conduct their daily business in a normal way and take action against anyone bent on causing trouble or disruption."

On Wednesday, Secretary of State John Reid warned no paramilitary violence would be tolerated on Northern Ireland's streets during the marching season.

His remarks came after the scenes of violence which followed Sunday's disputed Orange Order parade at Drumcree in Portadown, County Armagh.

It was banned from marching along the mainly nationalist Garvaghy Road on its return route to the town centre.